Definition of knock noun from the Oxford Advanced Learner's Dictionary

      

    knock

     noun
    noun
    BrE BrE//nɒk//
     
    ; NAmE NAmE//nɑːk//
     
     
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    at door/window
  1. 1  the sound of somebody hitting a door, window, etc. with their hand or with something hard to attract attention There was a knock on/at the door.
  2. hit
  3. 2  a sharp blow from something hard synonym bang He got a nasty knock on the head. Knocks and scratches will lower the value of valuable furniture.
  4. Word Origin Old English cnocian, of imitative origin.Extra examples Their pride took quite a knock when they lost 5–0. There was a loud knock at the door. You’ve had a nasty knock on the head. the hard knocks of life Her confidence took a knock when she lost her job. Knocks and scratches will lower the value of antique furniture.Idioms
    take a (hard, nasty, etc.) knock
     
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    to have an experience that makes somebody/something less confident or successful; to be damaged Industry in the area has taken a knock with the closure of two factories. Her confidence took a further knock when she lost her job.
See the Oxford Advanced American Dictionary entry: knock