knock - definition and synonyms

 
noun [countable] 

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/nɒk/
singularknock
pluralknocks
  1. 1

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    the sound of someone knocking on a door
    knock on/at:

    There was a loud knock at the door.

    1. a.
  2. 2
    an injury or damage caused by being knocked

    a nasty knock on the head

    1. a.
      an instance of knocking someone or something

      The watch is built to withstand the occasional knock.

  3. 3
    something bad or unpleasant that happens to someone
    hard knocks:

    Life is full of hard knocks.