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knock - definition and synonyms


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verb knock pronunciation in British English /nɒk/
Word Forms
present tense
present participleknocking
past tenseknocked
past participleknocked
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  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
    [intransitive] 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. 4
    [transitive] informal to criticize someone or something in a way that seems unfair
    The newspapers spend too much time knocking government policy.



a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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