- 1the sound of someone hitting a door, window, etc. with their hand or with something hard to attract attention There was a knock on/at the door.
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hit - 2a sharp blow from something hard synonym bang He had a nasty knock on the head. Knocks and scratches will lower the value of valuable furniture. Idioms
at door/window
to have an experience that makes someone or 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.
Check pronunciation: knock