knock Meaning in Cambridge American English Dictionary
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Meaning of "knock" - American English Dictionary

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knockverb

 us   /nɑk/

knock verb (MAKE NOISE)

[I] to repeatedly hit something, producing a noise: Someone is knocking at the door. Jane knocked on the window to attract his attention. [I] If an engine is knocking, it makes a repeated noise because of a mechanical problem.

knock verb (MOVE)

[T] to push into something or someone, often forcefully, causing the thing or person to move: Alice accidentally knocked the pot off the table. The blast knocked him off his feet.

knock verb (CRITICIZE)

[T] infml to criticize, esp. unfairly: She knocks every suggestion I make.
(Definition of knock from the Cambridge Academic Content Dictionary © Cambridge University Press)
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