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English definition of “knee”

knee

noun [C]     /niː/
B1 the middle joint of the leg, which allows it to bend: The baby was crawling around on its hands and knees. He got/went down on his knees (= got into a position where his knees were on the ground) in front of the altar. She took the child and sat it on her knee (= on the part of the leg above the knee when sitting down).The leg the part of a piece of clothing that covers the knee: She was wearing an old pair of trousers with rips at the knees.Parts of clothes
(Definition of knee noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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