knee
Pronunciation: /niː/
noun
- 1the joint between the thigh and the lower leg in humans.
- the joint in other animals that corresponds or is analogous to the human knee.
- the upper surface of someone’s thigh when they are sitting; a person’s lap: they were eating their suppers on their knees
- the part of a garment covering the knee.
verb ( knees, kneeing, kneed)

Phrases
-
at one's mother's (or father's) knee
- at an early age.
-
bend (or bow) the (or one's) knee
- submit: a country no longer willing to bend its knee to foreign powers
-
bring someone/thing to their/its knees
- reduce someone or something to a state of weakness or submission: the country was brought to its knees by a new strike
-
fall (or drop, or sink, etc.) to one's knees
- assume a kneeling position.
-
on bended knee (s)
- kneeling, especially when pleading or showing great respect: did your guy propose on bended knee?
-
on one's knees
- in a kneeling position.
- on the verge of collapse: when they took over, the newspaper was on its knees
-
weak at the knees
- overcome by a strong feeling, typically desire.

Origin:
Old English cnēow, cnēo, of Germanic origin; related to Dutch knie and German Knie, from an Indo-European root shared by Latin genu and Greek gonu