Definition - knock

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knock
  1. make light, repeated taps on a surface; "he was tapping his fingers on the table impatiently"
  2. the act of hitting vigorously; "he gave the table a whack"
  3. negative criticism
  4. a bad experience; "the school of hard knocks"
  5. the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder"
  6. a vigorous blow; "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head"
  7. find fault with; express criticism of; point out real or perceived flaws; "The paper criticized the new movie"; "Don't knock the food--it's free"
  8. deliver a sharp blow or push :"He knocked the glass clear across the room"
  9. knock against with force or violence; "My car bumped into the tree"
  10. rap with the knuckles; "knock on the door"
  11. sound like a car engine that is firing too early; "the car pinged when I put in low-octane gasoline"; "The car pinked when the ignition