Usage of the character 以

to think (i.e. to take it to be true that ...) (Usually there is an implication that the notion is mistaken – except when expressing one's own current opinion.)

jiāyǐ

加以

[加以]

in addition
moreover
(used before a disyllabic verb to indicate that the action of the verb is applied to sth or sb previously mentioned)
to apply (restrictions etc) to (sb)
to give (support, consideration etc) to (sth)

kěyǐ

可以

[可以]

can
may
possible
able to
not bad
pretty good

jièyǐ

藉以

[藉以]

variant of 借以 (jièyǐ)

làiyǐ

赖以

[賴以]

to rely on
to depend on

yǐnèi

以内

[以內]

within
less than

yǐjí

以及

[以及]

as well as
too
and

shìyǐ

是以

[是以]

therefore
thus
so

guànyǐ

冠以

[冠以]

to label
to call

yǐwài

以外

[以外]

apart from
other than
except for
external
outside of
on the other side of
beyond

gěiyǐ

给以

[給以]

to give
to grant

chúyǐ

除以

[除以]

(math.) divided by

wěiyǐ

委以

[委以]

(literary) to entrust with (a task); to appoint to (a role)

liáoyǐ

聊以

[聊以]

to use it (or do it) for the purpose of (allaying hunger, relieving boredom etc) to some extent

chéngyǐ

乘以

[乘以]

(math.) multiplied with

Yǐtàifáng

以太坊

[以太坊]

Ethereum

bùkěyǐ

不可以

[不可以]

may not

Yǐfúsuǒ

以弗所

[以弗所]

Ephesus, city of ancient Greece

Yǐsèliè

以色列

[以色列]

Israel

yǐzhìyú

以至于

[以至於]

down to
up to
to the extent that...

yǐlìyú

以利于

[以利於]

for the sake of
in order to

Yǐtàiwǎng

以太网

[以太網]

Ethernet

suǒyǐrán

所以然

[所以然]

the reason why

zhīsuǒyǐ

之所以

[之所以]

(after a noun N and before a predicate P) the reason why N P
Example: 我之所以討厭他／我之所以讨厌他 (wǒzhīsuǒyǐtǎoyàntā) "the reason why I dislike him (is ...)"

dekěyǐ

得可以

[得可以]

(coll.) (stative verb suffix) very; awfully

yǐyìjì

以亿计

[以億計]

to number in the thousands

Huáng Yǐjìng

黄以静

[黃以靜]

Wong Yee Ching or Flossie Wong-Staal (1946-2020) Hong Kong American virologist, joint discoverer of the HIV AIDS virus

Máo Yǐshēng

茅以升

[茅以升]

Mao Yisheng (1896-1989), Chinese structural engineer and social activist

Yǐlìyà

以利亚

[以利亞]

Elijah (Old Testament prophet)

yǐzhìyú

以致于

[以致於]

so that
to the point that

dàizhīyǐ

代之以

[代之以]

(has been) replaced with
(its) place has been taken by

yǐcǐwéi

以此为

[以此為]

to regard as
to treat as

Yǐsītiě

以斯帖

[以斯帖]

Esther (name)

Yǐfǎlián

以法莲

[以法蓮]

Ephraim (city)

Měiyǐměi

美以美

[美以美]

Methodist (Christian sect)

yǒushēngyǐlái

有生以来

[有生以來]

since birth
for one's whole life

cóngjīnyǐhòu

从今以后

[從今以後]

from now on
henceforward

nányǐzìyǐ

难以自已

[難以自已]

cannot control oneself (idiom)
to be beside oneself

yǐyízhìyí

以夷制夷

[以夷制夷]

to use foreigners to subdue foreigners (idiom); let the barbarians fight it out among themselves (traditional policy of successive dynasties)
Use Western science and technology to counter imperialist encroachment. (late Qing modernizing slogan)

yǐrénwéiběn

以人为本

[以人為本]

people-oriented

yǐhuázhìhuá

以华制华

[以華制華]

use Chinese collaborators to subdue the Chinese (imperialist policy)

chángjiǔyǐlái

长久以来

[長久以來]

for a long time now; long since

Yǐfúsuǒshū

以弗所书

[以弗所書]

Epistle of St Paul to the Ephesians

yǐmàoqǔrén

以貌取人

[以貌取人]

to judge sb by appearances (idiom)

shòurényǐbǐng

授人以柄

[授人以柄]

to hand someone the swordhilt (idiom)
to give someone a hold on oneself

yǐshìjǐngjiè

以示警戒

[以示警戒]

to serve as a warning (idiom)

Yǐsīlā Jì

以斯拉记

[以斯拉記]

Book of Ezra

xuéyǐzhìyòng

学以致用

[學以致用]

to study sth in order to apply it

xūxíyǐdài

虚席以待

[虛席以待]

to reserve a seat for sb (idiom)

yīzhíyǐlái

一直以来

[一直以來]

in the past always
for a long time now
until now

kuānyǐdàirén

宽以待人

[寬以待人]

to be lenient with others (idiom)

yǐxiàfànshàng

以下犯上

[以下犯上]

to disrespect one's superiors
to offend one's elders

yǐzhàiyǎngzhài

以债养债

[以債養債]

debt nurtures more debt (idiom)

bùyǐwéirán

不以为然

[不以為然]

not to accept as correct (idiom); to object
to disapprove
to take exception to

Yǐsèlièrén

以色列人

[以色列人]

an Israeli
an Israelite

yǐyìdàiláo

以逸待劳

[以逸待勞]

to wait at one's ease for the exhausted enemy
to nurture one's strength and bide one's time (idiom)

hàozhěngyǐxiá

好整以暇

[好整以暇]

to be calm and unruffled in the midst of chaos or at a busy time (idiom)

wényǐzàidào

文以载道

[文以載道]

words of truth
moral expressed in words
written article explaining a moral

qīyǐqífāng

欺以其方

[欺以其方]

deceived by a pretense of reason (idiom)

yǐshēnxiāngxǔ

以身相许

[以身相許]

to give one's heart to
to devote one's life to

xūjǐyǐtīng

虚己以听

[虛己以聽]

to listen to the ideas of others with an open mind (idiom)

nányǐyìngfù

难以应付

[難以應付]

hard to deal with
hard to handle

liáoyǐjiěmèn

聊以解闷

[聊以解悶]

to use it for the purpose of relieving the tedium to some extent

bǎoyǐlǎoquán

饱以老拳

[飽以老拳]

to thump repeatedly with one's fist

shùyǐwànjì

数以万计

[數以萬計]

tens of thousands
numerous

chīzhīyǐbí

嗤之以鼻

[嗤之以鼻]

to snort disdainfully
to scoff at
to turn up one's nose

yǐnyǐwéihàn

引以为憾

[引以為憾]

to consider sth regrettable (idiom)

xíyǐchéngxìng

习以成性

[習以成性]

deeply ingrained
steeped in

wàngqísuǒyǐ

忘其所以

[忘其所以]

see 忘乎所以 (wànghūsuǒyǐ)

yǐdúgōngdú

以毒攻毒

[以毒攻毒]

to cure ills with poison (TCM)
to fight evil with evil
set a thief to catch a thief
to fight fire with fire

chángqīyǐlái

长期以来

[長期以來]

for a long time

yǐshēndǐzhài

以身抵债

[以身抵債]

forced labor to repay a debt

nányǐlǐjiě

难以理解

[難以理解]

hard to understand
incomprehensible

bùzhī-suǒyǐ

不知所以

[不知所以]

to not know the reason
to not know what to do

yǐshǎoshèngduō

以少胜多

[以少勝多]

using the few to defeat the many (idiom); to win from a position of weakness

yǐxūdàishí

以虚带实

[以虛帶實]

to let correct ideology guide practical work (idiom)

Yǐlìyàsā

以利亚撒

[以利亞撒]

Eleazar (son of Eluid)

yǐshǐwéijiàn

以史为鉴

[以史為鑒]

to learn from history (idiom)

yǐpiāngàiquán

以偏概全

[以偏概全]

(lit.) to take a part for the whole
to generalize

yǐróukègāng

以柔克刚

[以柔克剛]

to use softness to conquer strength (idiom)

wěiyǐzhòngrèn

委以重任

[委以重任]

(literary) to entrust (sb) with an important task

yǐruòshèngqiáng

以弱胜强

[以弱勝強]

using the weak to defeat the strong (idiom); to win from a position of weakness

zhuójǐnyǐyú

濯锦以鱼

[濯錦以魚]

to make the ugly beautiful (idiom)

yǐgōngdàizhèn

以工代赈

[以工代賑]

to provide work to relieve poverty

yǐlínwéihè

以邻为壑

[以鄰為壑]

to use one's neighbor as a drain
to shift one's problems onto others (idiom)

bànshùyǐshàng

半数以上

[半數以上]

more than half

yǐshēnbàoguó

以身报国

[以身報國]

to give one's body for the nation (idiom); to spend one's whole life in the service of the country

wùyǐlèijù

物以类聚

[物以類聚]

similar things come together (idiom); like draws like
Birds of a feather flock together.

liáoyǐzìwèi

聊以自慰

[聊以自慰]

to find some consolation (idiom)
to find relief in

zīzīyǐqiú

孜孜以求

[孜孜以求]

diligent and tireless (idiom)

yǐnyǐwéi'ào

引以为傲

[引以為傲]

to be intensely proud of sth (idiom)

xíyǐwéicháng

习以为常

[習以為常]

accustomed to
used to

qiáoshǒuyǐdài

翘首以待

[翹首以待]

to hold one's breath (in anticipation) (idiom)
to anxiously await

Yǐtàiwǎnglù

以太网路

[以太網路]

Ethernet

yǐshēnzuòzé

以身作则

[以身作則]

to set an example (idiom); to serve as a model

shìmùyǐdài

拭目以待

[拭目以待]

lit. to wipe one's eyes and wait (idiom); to wait and see

yǐyīyùwàn

以一驭万

[以一馭萬]

to control a key point is to be master of the situation (idiom)

yǐbàozhìbào

以暴制暴

[以暴制暴]

to use violence to curb violence

yǐnyǐwéijiè

引以为戒

[引以為戒]

to take sth as a warning (idiom)
to draw a lesson from a case where things turned out badly

chízhīyǐhéng

持之以恒

[持之以恆]

to pursue unremittingly (idiom); to persevere

yǐshēnxǔguó

以身许国

[以身許國]

to dedicate oneself to the cause of one's country (idiom)

yèyǐjìrì

夜以继日

[夜以繼日]

night and day (idiom); continuous strenuous effort

shùyǐbǎijì

数以百计

[數以百計]

hundreds of

héyǐjiàndé

何以见得

[何以見得]

how can one be sure?

xìnyǐwéizhēn

信以为真

[信以為真]

to take sth to be true

sùyuànyǐcháng

夙愿以偿

[夙願以償]

a long-cherished ambition is realized

xiāngrúyǐmò

相濡以沫

[相濡以沫]

lit. (of fish) to moisten each other with spittle (when water is drying up) (idiom)
fig. to share meager resources
mutual help in humble circumstances

yǐshēnshìfǎ

以身试法

[以身試法]

to challenge the law (idiom)
to knowingly violate the law

quánlìyǐfù

全力以赴

[全力以赴]

to do at all costs
to make an all-out effort

yǐtāngwòfèi

以汤沃沸

[以湯沃沸]

to manage a situation badly (idiom)

wúyányǐduì

无言以对

[無言以對]

to be left speechless
unable to respond

yǐxiǎngdúzhě

以飨读者

[以饗讀者]

for the benefit of the reader

jùshíyǐgào

据实以告

[據實以告]

to report according to the facts
to tell the truth
to tell it like it is

yǐlèixǐmiàn

以泪洗面

[以淚洗面]

to bathe one's face in tears (idiom)

yǐdébàoyuàn

以德报怨

[以德報怨]

to return good for evil (idiom)
to requite evil with good

yǐhéwéiguì

以和为贵

[以和為貴]

harmony is to be prized

zìgǔyǐlái

自古以来

[自古以來]

since ancient times

zuòyǐdàibì

坐以待毙

[坐以待斃]

to sit and wait for death (idiom); resigned to one's fate

wúyǐwéibào

无以为报

[無以為報]

unable to return the favor

Yǐsītiějì

以斯帖记

[以斯帖記]

Book of Esther

shéngzhīyǐfǎ

绳之以法

[繩之以法]

to punish according to the law
to bring to justice

yǐyáhuányá

以牙还牙

[以牙還牙]

a tooth for a tooth (retaliation)

shùyǐyìjì

数以亿计

[數以億計]

countless
innumerable

yǐbèibùcè

以备不测

[以備不測]

to be prepared for accidents

shuāizhīyǐshǔ

衰之以属

[衰之以屬]

to treat a debility according to its nature

wúyǐwéishēng

无以为生

[無以為生]

no way to get by

diàoyǐqīngxīn

掉以轻心

[掉以輕心]

to treat sth lightly; to lower one's guard

yǒushǐyǐlái

有史以来

[有史以來]

since the beginning of history

yǐsǐmíngzhì

以死明志

[以死明志]

to demonstrate one's sincerity by dying

wùmèiyǐqiú

寤寐以求

[寤寐以求]

to crave day and night; to strongly desire

yǐběnrénmíng

以本人名

[以本人名]

under one's own name
named after oneself

yǐyàoyǎngyī

以药养医

[以藥養醫]

"drugs serving to nourish doctors", perceived problem in PRC medical practice

yōukǔyǐzhōng

忧苦以终

[憂苦以終]

worried to death (idiom)

zìyǐwéishì

自以为是

[自以為是]

to believe oneself infallible (idiom)
to be opinionated

xiǎoyǐdàyì

晓以大义

[曉以大義]

to reason with sb
to lecture

xíyǐchéngsú

习以成俗

[習以成俗]

to become accustomed to sth through long practice

yányǐlüjǐ

严以律己

[嚴以律己]

to be strict with oneself (idiom)
to demand a lot of oneself

nányǐrěnshòu

难以忍受

[難以忍受]

hard to endure
unbearable

yǐluǎnjīshí

以卵击石

[以卵擊石]

lit. to strike a stone with egg (idiom); to attempt the impossible
to invite disaster by overreaching oneself

nányǐqǐchǐ

难以启齿

[難以啟齒]

to be too embarrassed to mention sth (idiom)
to find it hard to speak about sth

Dànyǐlǐshū

但以理书

[但以理書]

Book of Daniel

nányǐshíxiàn

难以实现

[難以實現]

hard to accomplish
difficult to achieve

nányǐzhuōmō

难以捉摸

[難以捉摸]

elusive
hard to pin down
enigmatic

Yǐlìyàjìng

以利亚敬

[以利亞敬]

Eliakim (name, Hebrew: God will raise up)
Eliakim, servant of the Lord in Isaiah 22:20
Eliakim, son of Abiud and father of Azor in Matthew 1:13

yǐbàoyìbào

以暴易暴

[以暴易暴]

to replace one tyranny by another
to use violence against violence

Yǐsàiyàshū

以赛亚书

[以賽亞書]

Book of Isaiah

Yǐmǎnèilì

以马内利

[以馬內利]

Emanuel; Immanuel (name)

xūwèiyǐdài

虚位以待

[虛位以待]

to reserve a seat
to leave a position vacant

Yǐxījiéshū

以西结书

[以西結書]

Book of Ezekiel

yǐxiǎojǐdà

以小挤大

[以小擠大]

minor projects eclipse major ones (idiom)

jiǎnyǐyǎnglián

俭以养廉

[儉以養廉]

(idiom) frugality makes honesty

yǐquányāfǎ

以权压法

[以權壓法]

to abuse power to crush the law

yǐjǐngxiàoyóu

以儆效尤

[以儆效尤]

(idiom) to warn against following bad examples; as a warning to others

Yǐtàiwǎngluò

以太网络

[以太網絡]

Ethernet

mèngmèiyǐqiú

梦寐以求

[夢寐以求]

to yearn for sth even in one's dreams (idiom)
to long for sth day and night

bùyǐwéiyì

不以为意

[不以為意]

not to mind
unconcerned

yǐzīzhèngmíng

以资证明

[以資證明]

in support or witness hereof (idiom)

yǐ'échuán'é

以讹传讹

[以訛傳訛]

to spread falsehoods
to increasingly distort the truth
to pile errors on top of errors (idiom)

chēngmùyǐduì

瞠目以对

[瞠目以對]

to return only a blank stare
to stare back

wànghūsuǒyǐ

忘乎所以

[忘乎所以]

to get carried away
to forget oneself

wúyǐfùjiā

无以复加

[無以復加]

in the extreme (idiom)
incapable of further increase

cǐshíyǐqián

此时以前

[此時以前]

heretofore

yǐquánmóusī

以权谋私

[以權謀私]

to use one's position for personal gain (idiom)

yǐyǎnhuányǎn

以眼还眼

[以眼還眼]

an eye for an eye (idiom); fig. to use the enemy's methods against him
to give sb a taste of his own medicine

yǔyǐzhàogù

予以照顾

[予以照顧]

to ask sb to carefully consider a request (idiom)

nǔlìyǐfù

努力以赴

[努力以赴]

to use one's best efforts to do sth (idiom)

yǐrénfèiyán

以人废言

[以人廢言]

to reject a word because of the speaker (idiom, from Analects); to judge on preference between advisers rather than the merits of the case

yǐshènwéijiàn

以慎为键

[以慎為鍵]

to take caution as the key (idiom); to proceed very carefully

jiǎnyǐfángkuì

俭以防匮

[儉以防匱]

(idiom) waste not, want not

qínghéyǐkān

情何以堪

[情何以堪]

how can this be endured! (idiom)

nányǐhàndòng

难以撼动

[難以撼動]

unsusceptible to change
deeply entrenched

yǐlǐxiāngdài

以礼相待

[以禮相待]

to treat sb with due respect (idiom)

yǐcǐlèituī

以此类推

[以此類推]

and so on
in a similar fashion

yǐnyǐwéiróng

引以为荣

[引以為榮]

to regard it as an honor (idiom)

liáoyǐsèzé

聊以塞责

[聊以塞責]

in order to minimally fulfill one's responsibilities
in order to get off the hook

yǐwùyìwù

以物易物

[以物易物]

to barter
barter

nányǐzhìxìn

难以置信

[難以置信]

hard to believe
incredible

yǐqiánglíngruò

以强凌弱

[以強凌弱]

to use one's strength to bully the weak (idiom)

rúyuànyǐcháng

如愿以偿

[如願以償]

to have one's wish fulfilled

yǐyándàifǎ

以言代法

[以言代法]

to substitute one's words for the law (idiom); high-handedly putting one's orders above the law

kāishǐyǐqián

开始以前

[開始以前]

before the beginning (of sth)

shùyǐqiānjì

数以千计

[數以千計]

thousands (of sth)

yǐfángwànyī

以防万一

[以防萬一]

to guard against the unexpected (idiom); just in case
prepared for any eventualities

bùyǐcíhàizhì

不以词害志

[不以詞害誌]

don't let rhetoric spoil the message (idiom); don't get carried away with flowery speech to the detriment of what you want to say

Sāhālāyǐnán

撒哈拉以南

[撒哈拉以南]

sub-Saharan

yīyányǐbìzhī

一言以蔽之

[一言以蔽之]

one word says it all (idiom, from Analects); to cut a long story short
in a nutshell

xiǎngyǐbìméngēng

飨以闭门羹

[饗以閉門羹]

to close the door in one's face (idiom)

bùyǐcíhàizhì

不以辞害志

[不以辭害志]

don't let rhetoric spoil the message (idiom); don't get carried away with flowery speech to the detriment of what you want to say

yǐrénmíngmìngmíng

以人名命名

[以人名命名]

to name sth after a person
named after
eponymous

mínyǐshíwéitiān

民以食为天

[民以食為天]

Food is the God of the people. (idiom); People view food as the primary need.
Food first, ethical niceties second

yǐzìyáshārén

以眦睚杀人

[以眥睚殺人]

to kill sb for a trifle

zìdǒngshìyǐlái

自懂事以来

[自懂事以來]

for as long as one can remember

yǐlǎodàzìjū

以老大自居

[以老大自居]

regarding oneself as number one in terms of leadership, seniority or status

bùyǐrénfèiyán

不以人废言

[不以人廢言]

not to reject a word because of the speaker (idiom, from Analects); to judge on the merits of the case rather than preference between advisers

wùyǐxīwéiguì

物以稀为贵

[物以稀為貴]

the rarer sth is, the greater its value (idiom)

yǐtàiwǎngluòduānkǒu

以太网络端口

[以太網絡端口]

Ethernet port

yǐshībài'érgàozhōng

以失败而告终

[以失敗而告終]

to succeed through failure
to achieve one's final aim despite apparent setback

yǐbùbiànyìngwànbiàn

以不变应万变

[以不變應萬變]

(idiom) to deal with varying circumstances by adhering to a basic principle

kuàisùyǐtàiwǎngluò

快速以太网络

[快速以太網絡]

Fast Ethernet

jiāohuànyǐtàiwǎngluò

交换以太网络

[交換以太網絡]

switched Ethernet

xiàchóngbùkěyǐyǔbīng

夏虫不可以语冰

[夏蟲不可以語冰]

a summer insect cannot discuss ice (idiom)

xiétiānzǐyǐlìngzhūhóu

挟天子以令诸侯

[挾天子以令諸侯]

(expr.) hold the feudal overlord and you control his vassals

Sāhālāyǐnán Fēizhōu

撒哈拉以南非洲

[撒哈拉以南非洲]

sub-Saharan Africa

xiétiānzǐyǐlìngtiānxià

挟天子以令天下

[挾天子以令天下]

(expr.) hold the feudal overlord and you control the whole country

shīyíchángjìyǐzhìyí

师夷长技以制夷

[師夷長技以制夷]

"learn from the foreigners in order to gain command of them", idea advocated by Wei Yuan 魏源 ( Wèi Yuán)

tāshānzhīshíkěyǐgōngyù

他山之石可以攻玉

[他山之石可以攻玉]

lit. the other mountain's stone can polish jade (idiom); to improve oneself by accepting criticism from outside
to borrow talent from abroad to develop the nation effectively

yányǐzéjǐkuānyǐdàirén

严以责己宽以待人

[嚴以責己寬以待人]

to be severe with oneself and lenient with others (idiom)

yǐzhíbàoyuàn,yǐdébàodé

以直报怨，以德报德

[以直報怨，以德報德]

to repay kindness with kindness, and repay enmity with justice (idiom, from Analects)

wùyǐlèijù,rényǐqúnfēn

物以类聚，人以群分

[物以類聚，人以群分]

Similar things group together, similar people fit together (idiom); Birds of a feather flock together.

yǐyǎnhuányǎn,yǐyáhuányá

以眼还眼，以牙还牙

[以眼還眼，以牙還牙]

an eye for an eye, a tooth for a tooth (idiom)
fig. to use the enemy's methods against him
to give sb a taste of his own medicine

bùyǐwùxǐ,bùyǐjǐbēi

不以物喜，不以己悲

[不以物喜，不以己悲]

not to become attached to material things, not to pity oneself

lǎowúlǎo,yǐjírénzhīlǎo

老吾老，以及人之老

[老吾老，以及人之老]

to honor old people as we do our own aged parents

yīzhīhàozhìbùbìngyǐwéigōng

医之好治不病以为功

[醫之好治不病以為功]

doctors like to treat those who are not sick so that they can get credit for the patient's "recovery" (idiom)

yīzé-yǐxǐ,yīzé-yǐyōu

一则以喜，一则以忧

[一則以喜，一則以憂]

(idiom) happy on the one hand, but worried on the other

yǐzǐzhīmáo,gōngzǐzhīdùn

以子之矛，攻子之盾

[以子之矛，攻子之盾]

lit. use sb's spear to attack his shield (idiom, derived from Han Feizi 韓非子／韩非子); turning a weapon against its owner
fig. to attack an opponent using his own devices
hoist with his own petard

xīngxingzhīhuǒ,kěyǐliáoyuán

星星之火，可以燎原

[星星之火，可以燎原]

a single spark can start a huge blaze (idiom); an insignificant cause can have a massive effect

shīzhīháolí,chàyǐqiānlǐ

失之毫厘，差以千里

[失之毫釐，差以千里]

a tiny lapse can lead to a huge mistake (idiom); a minor discrepancy leading to enormous losses

yòuwúyòu,yǐjírénzhīyòu

幼吾幼，以及人之幼

[幼吾幼，以及人之幼]

to care for other's children as one's own

kěyǐyìhuì,bùkěyánchuán

可以意会，不可言传

[可以意會，不可言傳]

can be understood, but not described (idiom, from Zhuangzi 莊子／庄子 ( Zhuāngzǐ)); mysterious and subtle

chāzhīháolí,miùyǐqiānlǐ

差之毫厘，谬以千里

[差之毫釐，謬以千里]

the slightest difference leads to a huge error (idiom)
a miss is as good as a mile

shīzhīháolí,miùyǐqiānlǐ

失之毫厘，谬以千里

[失之毫厘，謬以千里]

a tiny lapse can lead to a huge mistake (idiom); a minor discrepancy leading to enormous losses

yǐyándàifǎ,yǐquányāfǎ

以言代法，以权压法

[以言代法，以權壓法]

to substitute one's words for the law and abuse power to crush it (idiom); completely lawless behavior
Might makes right.

shòuzhīyǐyúbùrúshòuzhīyǐyú

授之以鱼不如授之以渔

[授之以魚不如授之以漁]

give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime (idiom)

bùyǐguīju,bùnéngchéngfāngyuán

不以规矩，不能成方圆

[不以規矩，不能成方圓]

without rules, nothing can be done (idiom, from Mencius); one must follow some rules

shòurényǐyúbùrúshòurényǐyú

授人以鱼不如授人以渔

[授人以魚不如授人以漁]

give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime
knowledge is the best charity

zhīqírán'érbùzhīqísuǒyǐrán

知其然而不知其所以然

[知其然而不知其所以然]

(idiom) to know that it is so but not why it is so

méiyǒuguīju,héyǐchéngfāngyuán

没有规矩，何以成方圆

[沒有規矩，何以成方圓]

without rules, how can anything be done (idiom); one must follow some rules

yǐxiǎorénzhīxīn,duójūnzǐzhīfù

以小人之心，度君子之腹

[以小人之心，度君子之腹]

to gauge the heart of a gentleman with one's own mean measure (idiom)

yǐqírénzhīdào,huánzhìqírénzhīshēn

以其人之道，还治其人之身

[以其人之道，還治其人之身]

to use an opponent's own methods to obtain retribution (idiom, from Song dynasty neo-Confucianist Zhu Xi 朱熹 ( Zhū Xī))
to get revenge by playing sb back at his own game; to give sb a taste of his own medicine

lǎowúlǎo,yǐjírénzhīlǎo,yòuwúyòu,yǐjírénzhīyòu

老吾老，以及人之老，幼吾幼，以及人之幼

[老吾老，以及人之老，幼吾幼，以及人之幼]

to honor old people as we do our own aged parents, and care for other's children as one's own