knee
nounThe joint between the thigh and the lower leg, formed by the articulation of the femur and the tibia and covered anteriorly by the patella.
nounThe region of the leg that encloses and supports this joint.
nounAn analogous joint or part of a leg of a quadruped vertebrate.
nounThe joint between the femur and the tibia in an insect leg.
nounSomething resembling the human knee, such as a bent piece of pipe.
nounThe part of a garment, as of trousers, that covers the knee.
nounA vertical, often conical, woody projection arising from the roots of certain swamp-growing trees.
transitive verbTo strike with the knee.
idiom(take a knee) To kneel down on one knee.