Usage of the character 开

lit. to open a water source and reduce outflow (idiom); to increase income and save on spending
to broaden the sources of income and economize on expenditure

kāidàyóumén

开大油门

[開大油門]

to open the throttle
to accelerate
to let her rip

kāichúxuéjí

开除学籍

[開除學籍]

to expel from school

xīnxiōngkāikuò

心胸开阔

[心胸開闊]

broad-minded
open-minded

gǒudòudàkāi

狗窦大开

[狗竇大開]

dog hole wide open (idiom); fig. gap caused by missing teeth (used mockingly)

kāichúdǎngjí

开除党籍

[開除黨籍]

to expel from the Party

kāishǐyǐqián

开始以前

[開始以前]

before the beginning (of sth)

dǎkāihuàxiázi

打开话匣子

[打開話匣子]

to start talking

kāifàngshìwǎngluò

开放式网络

[開放式網絡]

open network

qìguǎnqiēkāishù

气管切开术

[氣管切開術]

tracheotomy (medicine)

Mǐkāilǎngjīluó

米开朗基罗

[米開朗基羅]

Michelangelo Buonarroti (1475-1564), Renaissance painter and sculptor

sānqīkāidìnglùn

三七开定论

[三七開定論]

thirty percent failure, seventy percent success, the official PRC verdict on Mao Zedong

xiōngkuòqiēkāishù

胸廓切开术

[胸廓切開術]

thoracotomy (medicine)

Mǐkāilánjīluó

米开兰基罗

[米開蘭基羅]

Michelangelo (Tw)

Kāibó'ěrshānkǒu

开伯尔山口

[開伯爾山口]

Khyber pass (between Pakistand and Afghanistan)

Tiān'ānménkāile

天安门开了

[天安門開了]

pants fly is down
the barn door is open

wànshìkāitóunán

万事开头难

[萬事開頭難]

every beginning is difficult (idiom)
getting started is always the hardest part

Fēngbìxìng Kāijú

封闭性开局

[封閉性開局]

Closed Game
Double Queen Pawn Opening (chess)
same as 雙后前兵開局／双后前兵开局

kāifàngyuándàimǎ

开放源代码

[開放源代碼]

see 開放源碼／开放源码 (kāifāngyuánmá)

kāigōngbùfàngjiàn

开弓不放箭

[開弓不放箭]

lit. to draw the bow without shooting the arrow (idiom)
fig. to bluff
to be all talk and no action
false bravado

kāifàngshìxìtǒng

开放式系统

[開放式系統]

open system(s)

Kāitángshǒu Jiékè

开膛手杰克

[開膛手傑克]

Jack the Ripper

gōngkāitǎolùnhuì

公开讨论会

[公開討論會]

open forum

kāifàngyuánmǎruǎnjiàn

开放源码软件

[開放源碼軟件]

open-source software (OSS)

kāifàngxìtǒnghùlián

开放系统互连

[開放系統互連]

open systems interconnection
OSI

shuānghòuqiánbīngkāijú

双后前兵开局

[雙后前兵開局]

Double Queen Pawn Opening
Closed Game (chess)
same as 封閉性開局／封闭性开局

Yàzhōu Kāifā Yínháng

亚洲开发银行

[亞洲開發銀行]

Asian Development Bank

ruǎnjiànkāifārényuán

软件开发人员

[軟件開發人員]

software developer

guǎnzhùzuǐmàikāituǐ

管住嘴迈开腿

[管住嘴邁開腿]

lit. shut your mouth, move your legs (motto for losing weight)

shǒucìgōngkāizhāogǔ

首次公开招股

[首次公開招股]

initial public offering (IPO)

Guójiā Kāifā Yínháng

国家开发银行

[國家開發銀行]

China Development Bank

Fēizhōu Kāifā Yínháng

非洲开发银行

[非洲開發銀行]

African Development Bank

dǎkāitiānchuāngshuōliànghuà

打开天窗说亮话

[打開天窗說亮話]

(let's) not mince words; (let's) not beat about the bush

Yángpǔjīngjìkāifāqū

洋浦经济开发区

[洋浦經濟開發區]

Yangpu Economic Development Zone, Hainan

kāigōngméiyǒuhuítóujiàn

开弓没有回头箭

[開弓沒有回頭箭]

lit. once you've shot the arrow, there's no getting it back (idiom)
fig. once you started sth, there's no turning back
to have to finish what one started
to be determined to reach one's goals in spite of setbacks

sǐzhūbùpàkāishuǐtàng

死猪不怕开水烫

[死豬不怕開水燙]

lit. a dead pig doesn't fear scalding water (idiom)
fig. a person who has nothing more to lose will go to any lengths, regardless of the consequences

nǎhúbùkāitínǎhú

哪壶不开提哪壶

[哪壺不開提哪壺]

lit. mention the pot that doesn't boil (idiom); to touch a sore spot
to talk about sb's weak point

Jīngjì Xiélì Kāifā Jīgòu

经济协力开发机构

[經濟協力開發機構]

Organization for Economic Cooperation and Development (OECD)
also written 經濟合作與發展組織／经济合作与发展组织 ( Jīngjì Hézuòyǔ Fāzhǎn Zǔzhī)

Liánhéguó Kāifā Jìhuàshǔ

联合国开发计划署

[聯合國開發計劃署]

United Nations Development Program

yībǎyàoshikāiyībǎsuǒ

一把钥匙开一把锁

[一把鑰匙開一把鎖]

One key opens one lock.
There is a different solution for each problem. (idiom)

yīfū-dāngguān,wànfū-mòkāi

一夫当关，万夫莫开

[一夫當關，萬夫莫開]

(idiom) one man guarding the pass can prevent the passage of ten thousand

jīngchéngsuǒzhì,jīnshíwèikāi

精诚所至，金石为开

[精誠所至，金石為開]

lit. metal and stone yield to power of sincerity (idiom)
fig. no difficulty is insurmountable if one is sincere

jīngchéngsuǒjiā,jīnshíwèikāi

精诚所加，金石为开

[精誠所加，金石為開]

see 精誠所至，金石為開／精诚所至，金石为开 (jīngchéngsuǒzhì,jīnshíwèikāi)

Wēnbù'ěrdēng Wǎngqiú Gōngkāisài

温布尔登网球公开赛

[溫布爾登網球公開賽]

Wimbledon Championships (tennis)

huāyǒuchóngkāirì,rénwúzàishàonián

花有重开日，人无再少年

[花有重開日，人無再少年]

a flower may blossom again, but a person cannot get young again (proverb)