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knock

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verb American English pronunciation: knock /nɑk/ 
Word Forms
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present tense
I/you/we/theyknock
he/she/itknocks
present participleknocking
past tenseknocked
past participleknocked
  1. 1
    [intransitive/transitive] to hit something, causing damage or harm

    Mike had knocked his leg against a table.

    1. a.
      [transitive] to hit something and force it somewhere

      He knocked a couple of nails into the door.

    2. b.
      [transitive] to hit someone very hard, so that they fall or become unconscious
      knock someone to/off/over/down:

      They knocked him to the ground.

      The force was powerful enough to knock him off balance.

      knock someone off their feet:

      Each fighter tries to knock the other off his feet.

      knock someone unconscious:

      The driver had been knocked unconscious by the impact.

    3. c.
      [transitive] to hit a ball

      He knocked two out of the park.

    4. d.
  2. 3
    [transitive] informal to criticize someone or something in a way that seems unfair

    The newspapers spend too much time knocking government policy.

  3. 4
    [intransitive] Sound effect: knock to hit a door with your hand or a knocker so that someone inside knows you are there

    They walked up to the door and knocked loudly.

    knock on/at:

    I knocked on his door but got no answer.

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