Etymology
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knee (n.)

"joint between the principal bones of the leg," Old English cneo, cneow "knee," from Proto-Germanic *knewa- (source also of Old Norse kne, Old Saxon kneo, Old Frisian kni, Middle Dutch cnie, Dutch knie, Old High German kniu, German Knie, Gothic kniu), from PIE root *genu- (1) "knee; angle." For pronunciation, see kn-.

To be across (someone's) knee in reference to spanking is from 1866. Knee-breeches is from 1827; knee-pants is from 1858. Knee-slapper "funny joke" is from 1955.

knee (v.)

early 13c., "to bend the knee, kneel," from Old English cneowian, from cneow (see knee (n.)). The meaning "to strike with the knee" is first recorded 1892. Related: Kneed; kneeing.

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Definitions of knee

knee (n.)
hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella;
Synonyms: knee joint / human knee / articulatio genus / genu
knee (n.)
joint between the femur and tibia in a quadruped; corresponds to the human knee;
Synonyms: stifle
knee (n.)
the part of a trouser leg that provides the cloth covering for the knee;
From wordnet.princeton.edu