膝

促膝

cù xī

to sit knee to knee

双膝

shuāng xī

both knees

齐膝

qí xī

level with one's knees

促膝谈心

cù xī tán xīn

(idiom) to sit side-by-side and have a heart-to-heart talk

卑躬屈膝

bēi gōng qū xī

to bow and bend the knee (idiom); fawning

奴颜婢膝

nú yán bì xī

servile and bending the knee (idiom); fawning

屈膝礼

qū xī lǐ

curtsy

牛膝

niú xī

Achyranthes bidentata (root used in Chinese medicine)

牛膝草

niú xī cǎo

hyssop (Hyssopus officinalis)

男人膝下有黄金

nán rén xī xià yǒu huáng jīn

lit. the man has gold under his knees; fig. a man who does not easily kneel in front of others (owing to pride or moral integrity)

盘膝

pán xī

cross-legged

磕膝盖

kē xī gài

(dialect) knee