Definition of

Knock

  1. (noun, act) the act of hitting vigorously
  2. (noun, cognition) negative criticism
  3. (noun, event) a bad experience
  4. (noun, event) the sound of knocking (as on a door or in an engine or bearing)
  5. (noun, event) a vigorous blow
    he took a bash right in his face
    he got a bang on the head
  6. (verb, communication) find fault with; express criticism of; point out real or perceived flaws
    Don't knock the food--it's free
  7. (verb, contact) deliver a sharp blow or push :
  8. (verb, contact) knock against with force or violence
  9. (verb, contact) rap with the knuckles
  10. (verb, perception) sound like a car engine that is firing too early
    The car pinked when the ignition was too far retarded
  11. (verb, perception) make light, repeated taps on a surface

via WordNet, Princeton University

Origin of the word Knock

  1. O.E. cnocian (W.Saxon cnucian), likely of imitative origin. Meaning "deprecate, put down" is from 1892. Knockoff "cheap imitation" is from 1966. Knock out "to stun by a blow for a 10-count" in boxing is short for to knock out of time; slang knockout "attractive person" is from 1892. To knock oneself out "make a great effort" is f… more

via Online Etymology Dictionary, ©2001 Douglas Harper

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