knee

at one's mother's (或 father's) knee

at an early age

儿时

bend (或 bow) the (或 one's) knee (to)

kneel in submission; submit

下跪，屈服

bring someone/thing to their/its knees

reduce someone or something to a state of weakness or submission

迫使某人（或物）屈从

fall (或 drop，或 sink，等) to one's knees

assume a kneeling position

下跪，跪下

on bended knee(s)

kneeling, especially in entreaty or worship

（尤指乞求或崇拜时）跪着

did your guy propose on bended knee?.

你男朋友是不是跪着求婚的？。

on one's knees

in a kneeling position

跪着

weak at the knees

overcome by a strong feeling, typically desire

被（强烈感情，尤指欲望）屈服