Usage of the character 阴

a deal where the parties collude to sign an under-the-table "yin contract" 陰合同／阴合同 as well as an ostensibly genuine "yang contract" 陽合同／阳合同 in order to deceive authorities

yángfèngyīnwéi

阳奉阴违

[陽奉陰違]

outward devotion but inner opposition (idiom); to pay lip service
to agree overtly, but oppose in secret

yīnyángguàiqì

阴阳怪气

[陰陽怪氣]

eccentric
peculiar
mystifying

yīnmóuguǐjì

阴谋诡计

[陰謀詭計]

crafty plots and machinations (idiom)

yīnxiǎndúlà

阴险毒辣

[陰險毒辣]

treacherous and murderous

yīmìngguīyīn

一命归阴

[一命歸陰]

see 一命嗚呼／一命呜呼 (yīmìngwūhū)

yīnxūhuǒwàng

阴虚火旺

[陰虛火旺]

an excess of heat caused by a deficiency in Yin energy (idiom)

yīncáodìfǔ

阴曹地府

[陰曹地府]

netherworld
Kingdom of the Underworld
Hades

xūdùguāngyīn

虚度光阴

[虛度光陰]

to waste time on worthless activities

yīnhúnbùsàn

阴魂不散

[陰魂不散]

lit. the soul of a deceased has not yet dispersed (idiom)
fig. the influence still lingers on
the spirit (of some doctrine) is still alive

yīnchāyángcuò

阴差阳错

[陰差陽錯]

(idiom) due to an unexpected turn of events

yīncuòyángchā

阴错阳差

[陰錯陽差]

(idiom) due to an unexpected turn of events

guāngyīnsìjiàn

光阴似箭

[光陰似箭]

time flies like an arrow (idiom); How time flies!

línyīndàdào

林阴大道

[林陰大道]

boulevard
tree-lined avenue
CL:條／条 (tiáo)

Gélánshìyīnxìng

革兰氏阴性

[革蘭氏陰性]

Gram negative (bacteria that do not retain Gram stain, often the more dangerous kind)

yīngōulǐfānchuán

阴沟里翻船

[陰溝裡翻船]

to meet with unexpected failure (idiom)
to fail miserably (where failure was not expected)

jiāochāyīnyǐngxiàn

交叉阴影线

[交叉陰影線]

hatched lines
cross-hatched graphic pattern

yīnjíshèxiànguǎn

阴极射线管

[陰極射線管]

cathode ray tube

yīnlízǐbùwèi

阴离子部位

[陰離子部位]

anionic site

gélánshìyīnxìng

格兰氏阴性

[格蘭氏陰性]

Gram negative (of bacteria)
also written 革蘭氏陰性／革兰氏阴性

yīndébìyǒuyángbào

阴德必有阳报

[陰德必有陽報]

hidden merits will have visible rewards (idiom)

wúxīnchāliǔliǔchéngyīn

无心插柳柳成阴

[無心插柳柳成陰]

lit. idly poke a stick in the mud and it grows into a tree to shade you
(fig.) unintentional actions may bring unexpected success
also written 無心插柳柳成蔭／无心插柳柳成荫

yīcùnguāngyīnyīcùnjīn

一寸光阴一寸金

[一寸光陰一寸金]

(idiom) time is precious

cùnjīnnánmǎicùnguāngyīn

寸金难买寸光阴

[寸金難買寸光陰]

An ounce of gold can't buy you an interval of time (idiom); Money can't buy you time.
Time is precious.

yīnmóudiānfùzhèngfǔzuì

阴谋颠覆政府罪

[陰謀顛覆政府罪]

the crime of conspiracy to overthrow the government

yīcùnguāngyīnyīcùnjīn,cùnjīnnánmǎicùnguāngyīn

一寸光阴一寸金，寸金难买寸光阴

[一寸光陰一寸金，寸金難買寸光陰]

lit. an interval of time is worth an ounce of gold, money cannot buy you time (idiom)
fig. time is precious

yǒuyìzāihuāhuābùfā,wúxīnchāliǔliǔchéngyīn

有意栽花花不发，无心插柳柳成阴

[有意栽花花不發，無心插柳柳成陰]

lit. you plant a garden and the flowers do not bloom, you poke a stick in the mud and it grows into a tree
fig. things do not always turn out as one would expect
well-laid plans may fail, and success may come where you least expect it