knee
[ni:]
n.
膝, 膝盖

knee-bending
n.
屈膝

kneeguard
n.
护膝(装置)

knee-hop
n.
蹲跳(青蛙跳)

have one's knees under sb.'s mahogany
受某人款待(吃饭)
put one's knees under sb.'s mahogany
受某人款待(吃饭)
stretch one's knees under sb.'s mahogany
受某人款待(吃饭)

on the knees of the gods
人力所不及的; 尚未可知[定]的