The definition of knee is the joint between the thigh and lower leg.(noun)
An example of a knee is the part of the body on which a person kneels.
Knee is defined as to hit or strike using the joint between the thigh and lower leg.(verb)
An example of knee is to hit a soccer ball with this joint.
See knee in Webster's New World College Dictionary
Origin: ME kne < OE cneow, akin to Ger knie < IE base *ĝeneu- > Sans jnu, Gr gony, gonia, L genu, a knee
See knee in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English cnēo; see genu-1 in Indo-European roots.
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