knee

Etymology

From Middle English kne, from Old English cnēow, from Proto-West Germanic *kneu, from Proto-Germanic *knewą, from Proto-Indo-European *ǵnéw-o-m, a thematic derivative of *ǵónu. See also Low German Knee, Dutch knie, German Knie, Danish knæ, Norwegian kne, Swedish knä; also Hittite 𒄀𒉡 (genu), Latin genū, Tocharian A kanweṃ (dual), Tocharian B kenī, Ancient Greek γόνυ (gónu, “knee”), γωνία (gōnía, “corner, angle”), Welsh glin (“knee”), Old Armenian ծունր (cunr), Avestan 𐬲𐬥𐬎𐬨 (žnum), Sanskrit जानु (jā́nu). The obsolete plural kneen is from Middle English kneen, knen, kneon, kneuwene.

noun

1. In humans, the joint or the region of the joint in the middle part of the leg between the thigh and the shank.
   Penny was wearing a miniskirt, so she skinned her exposed knees when she fell.
   KORRIS: I have tasted your heart. You have been with them, but you are still "of" us. Do not deny the challenge of your destiny. Get off your knees and soar. Open your eyes and let the dream take flight. March 21, 1988, Vaughn Armstrong, Heart of Glory (Star Trek: The Next Generation) (Science Fiction), Paramount Domestic Television, →OCLC
2. In the horse and allied animals, the carpal joint, corresponding to the wrist in humans.
3. The part of a garment that covers the knee.
4. (shipbuilding) A piece of timber or metal formed with an angle somewhat in the shape of the human knee when bent.
   Deck beams were supported by hanging knees, triangular pieces of wood typically found underneath the timbers they are designed to support, but in this case found above them. 1980, Richard W. Unger, The Ship in the Medieval Economy 600-1600, page 41
5. (archaic) An act of kneeling, especially to show respect or courtesy.
   […] and he made a knee to the Caesar of Patna, giving that man all honour due to him. 2009, C. E. Murphy, The Pretender's Crown, page 127
6. Any knee-shaped item or sharp angle in a line; an inflection point.
   the knee of a graph
7. A blow made with the knee; a kneeing.
   Tante was groggy but not quite out so Winnie gave him a knee to the jaw that Rose had shown her, and that was enough. He slumped like a rag-doll to the floor. 2016, Clive Mullis, Scooters Yard
8. (figurative) The presence of a parent etc., where a young child acquires early knowledge.
   The duty is, or should be, a thing taught at one's father's knee, and the structure of the family gently enforces it. 1978, Time, volume 111, numbers 18-26, page 49
   This has significant implications for sacramental theology which it seems Pusey even realised in the way he spoke of his early life and of learning all he knew about the Eucharist and the Catholic faith at his mother's knee, […] 2015, Brian Douglas, The Eucharistic Theology of Edward Bouverie Pusey, page 113

verb

1. (transitive, archaic) To kneel to.
2. (transitive) To poke or strike with the knee.
   When I blocked her from leaving, she kneed me in the groin.
3. (reflexive) To move on the knees; to use the knees to move.
   Hassan kneed himself up, over, in, soundlessly, feet on floor, knife out, eyes like blunter knife trying to cut darkness. 1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 489