knock - definition and synonyms


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present tense
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.

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

      He knocked a couple of nails into the door.

       Synonyms and related words
    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 unconscious:

      The driver had been knocked unconscious by the impact.

    3. c.
      [transitive] to make a hole or space in something by hitting it many times

      They knocked a hole for the doorway.

  2. 2

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    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 reply.

  3. 3
    [intransitive] if an engine or machine knocks, it makes noises that show it is not working correctly
  4. 4
    [transitive] informal to criticize someone or something in a way that seems unfair
See also