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knee

noun, the joint of the human leg connecting the tibia and fibula with the femur and protected in front by the patella. Technical name: genu. Related adj genicular

knew

verb, the past tense of know

know

verb, to be or feel certain of the truth or accuracy of (a fact, etc)

know-how

noun, ingenuity, aptitude, or skill; knack

known

verb, the past participle of know