knee

1 knee /ˈniː/ noun
plural knees
1 knee
/ˈniː/
noun
plural knees
Britannica Dictionary definition of KNEE
[count]
1 
: the joint that bends at the middle of your leg
— see picture at human
2 
: the upper part of your leg when you are sitting
3 
: the part that covers the knee on a pair of pants
4 
: a forceful hit with a bent knee

bring (someone) to his/her knees

: to completely defeat or overwhelm (someone)
— often used figuratively

learn (something) at your mother's knee

: to learn (something) when you are very young

on bended knee/knees

— see 1bend

weak at/in the knees

— see weak
2 knee /ˈniː/ verb
knees; kneed; kneeing
2 knee
/ˈniː/
verb
knees; kneed; kneeing
Britannica Dictionary definition of KNEE
[+ object]
: to hit (a person) with your knee