胆

卧薪尝胆

wò xīn cháng dǎn

lit. to sleep on brushwood and taste gall (like King Goujian of Yue 勾踐|勾践[Gou1 jian4], in order to recall one's humiliations) (idiom)

惊心胆颤

jīng xīn dǎn chàn

frightening

鼠胆

shǔ dǎn

cowardly

龙肝凤胆

lóng gān fèng dǎn

rare food

龙胆

lóng dǎn

rough gentian

龙胆紫

lóng dǎn zǐ

gentian violet C25H30ClN3

一身是胆

yī shēn shì dǎn

devoid of fear (idiom)

乙酰胆碱

yǐ xiān dǎn jiǎn

acetylcholine ACh (amine related to vitamin B complex)

倾心吐胆

qīng xīn tǔ dǎn

to pour out one's heart (idiom)

内胆

nèi dǎn

inner container (e.g. the rice pot inside a rice cooker, the vacuum bottle inside a thermos, the tank inside a hot water heater, the bladder of a football)

剖肝沥胆

pōu gān lì dǎn

(idiom) to be completely honest and sincere

吃熊心豹子胆

chī xióng xīn bào zi dǎn

to eat bear heart and leopard gall (idiom)