Usage of the character 輕

lit. an easy drive on a familiar path (idiom); fig. experience makes progress easy
a task that is so familiar one can do it with one's hand tied behind one's back

wèndǐngqīngzhòng

问鼎轻重

[問鼎輕重]

lit. to inquire whether the tripods are light or heavy (idiom); a laughable attempt to seize power

qīngshēngxìyǔ

轻声细语

[輕聲細語]

to speak softly
to whisper (idiom)

qīngzhònghuǎnjí

轻重缓急

[輕重緩急]

slight or important, urgent or non-urgent (idiom); to deal with important matters first
sense of priority

bùzhīqīngzhòng

不知轻重

[不知輕重]

lit. not knowing what's important (idiom); no appreciation of the gravity of things
naive
doesn't know who's who
no sense of priorities

qīngshǒuqīngjiǎo

轻手轻脚

[輕手輕腳]

(to move or do sth) softly and quietly (idiom)

qīng'éryìjǔ

轻而易举

[輕而易舉]

easy
with no difficulty

niánqīnglìzhuàng

年轻力壮

[年輕力壯]

young and vigorous (idiom)

qīngjǔwàngdòng

轻举妄动

[輕舉妄動]

to act blindly without thinking (idiom)

qīngchēshúlù

轻车熟路

[輕車熟路]

lit. to drive a lightweight chariot on a familiar road (idiom)
fig. to do sth routinely and with ease
a walk in the park

wénrénxiāngqīng

文人相轻

[文人相輕]

scholars tend to disparage one another (idiom)

shēnqīngrúyàn

身轻如燕

[身輕如燕]

as lithe as a swallow (of athlete or beautiful girl)

qīngyánxìyǔ

轻言细语

[輕言細語]

to speak softly

jǔzúqīngzhòng

举足轻重

[舉足輕重]

to play a critical role (idiom)
influential

qīngzuǐbóshé

轻嘴薄舌

[輕嘴薄舌]

lit. light mouth, thin tongue (idiom); hasty and rude
caustic and sharp-tongued

qīngqiúféimǎ

轻裘肥马

[輕裘肥馬]

lit. light furs and stout horses
fig. to live in luxury

qīngmiáodànxiě

轻描淡写

[輕描淡寫]

(idiom) to treat sth as no big deal
to downplay
to understate

Bǎishìqīngyí

百事轻怡

[百事輕怡]

Diet Pepsi
Pepsi Light

zhònglìqīngyì

重利轻义

[重利輕義]

to value material gain over righteousness

qīngráosùfàng

轻饶素放

[輕饒素放]

easily forgive, simply release (idiom); to let sb off scot free

qīngzhìshíyóu

轻质石油

[輕質石油]

light petroleum (product)
gasoline and diesel oil

qīnglàngfúbó

轻浪浮薄

[輕浪浮薄]

(idiom) frivolous

zìqīngzìjiàn

自轻自贱

[自輕自賤]

to belittle oneself
self-contempt

tóuzhòngjiǎoqīng

头重脚轻

[頭重腳輕]

top-heavy
fig. unbalance in organization or political structure

qīngzhòngdàozhì

轻重倒置

[輕重倒置]

to invert the importance of things (i.e. stress the unimportant and neglect the important)
lacking a sense of perspective
to put the cart before the horse

huǎnjíqīngzhòng

缓急轻重

[緩急輕重]

slight or important, urgent or non-urgent (idiom); to deal with important matters first
sense of priority
also written 輕重緩急／轻重缓急

niánqīngyǒuwéi

年轻有为

[年輕有為]

young and promising

qīngzhòngzhǔcì

轻重主次

[輕重主次]

to invert the importance of things (i.e. stress the incidental and neglect the main point)
lacking a sense of perspective
to put the cart before the horse

lǐqīngrényìzhòng

礼轻人意重

[禮輕人意重]

slight present but weighty meaning (idiom); It's not the present the counts, it's the thought behind it.

Bùlúnqīngjīqiāng

布伦轻机枪

[布倫輕機槍]

Bren gun, British light machine gun first produced in 1937

qīngshuǐfǎnyìngduī

轻水反应堆

[輕水反應堆]

light water reactor (LWR)

lǐqīngqíngyìzhòng

礼轻情意重

[禮輕情意重]

goose feather sent from afar, a trifling present with a weighty thought behind it (idiom); It's not the gift that counts, but the thought behind it.

zhòngxíngshìqīngnèiróng

重形式轻内容

[重形式輕內容]

heavy on form, light on substance
to stress form at the expense of content

qīngxíngguǐdàojiāotōng

轻型轨道交通

[輕型軌道交通]

light rail
transit system (underground, at street level or elevated)
streetcar
metro
abbr. to 輕軌／轻轨 (qīngguǐ)

qīngzhìshíyóuchǎnpǐn

轻质石油产品

[輕質石油產品]

light petroleum product (i.e. gasoline and diesel oil)

nán'éryǒulèibùqīngtán

男儿有泪不轻弹

[男兒有淚不輕彈]

real men do not easily cry (idiom)

lǐqīngrényìzhòng,qiānlǐsòng'émáo

礼轻人意重，千里送鹅毛

[禮輕人意重，千里送鵝毛]

goose feather sent from afar, a slight present but weighty meaning (idiom); It's not the present the counts, it's the thought behind it.

qiānlǐsòng'émáo,lǐqīngrényìzhòng

千里送鹅毛，礼轻人意重

[千里送鵝毛，禮輕人意重]

goose feather sent from afar, a slight present but weighty meaning (idiom); It's not the present the counts, it's the thought behind it.

qiānlǐsòng'émáo,lǐqīngqíngyìzhòng

千里送鹅毛，礼轻情意重

[千里送鵝毛，禮輕情意重]

goose feather sent from afar, a trifling present with a weighty thought behind it (idiom); It's not the gift that counts, but the thought behind it.

jiāchǒubùkěwàichuán,liúyánqièmòqīngxìn

家丑不可外传，流言切莫轻信

[家醜不可外傳，流言切莫輕信]

Don't spread abroad the shame of the family, don't believe rumors lightly. (idiom)
Don't wash your dirty linen in public, don't listen to others' gossip.