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knock [ˈnɑːk]

1 knock verb
  • to hit something (such as a door) with the knuckles of your hand or with a hard object (such as a knocker) in order to get people's attention —usually + on —sometimes used figuratively
  • to hit (something or someone) in a forceful way
  • to touch or hit someone or something in a way that is not planned or intended
2 knock noun
  • a hard, sharp hit
  • the sound made by a hard hit
  • an experience that makes you less confident or successful for a period of time : a difficult or painful experience