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Meaning of “knock” - Learner’s Dictionary

knock

verb     /nɒk/
MAKE NOISE [I]
B1 to make a noise by hitting something, especially a door, with your closed hand in order to attract someone's attention: There's someone knocking at/on the door. Please knock before entering.Hitting against objects accidentally and collidingSounds made by objects, movement or impact
HIT [T]
B1 to hit something or someone and make them move or fall down: He accidentally knocked the vase off the table. I knocked over the mug. He was knocked unconscious by the blast.Hitting against objects accidentally and collidingHitting and beatingPunishing by causing pain
CRITICIZE [T] informal
to criticize someone or something, often unfairly: She knocks every suggestion I make.Disapproving and criticizingDamaging reputation
→  See also beat/knock the (living) daylights out of sb , Knock it off! , knock sth back , knock sb down , knock sb/sth down , knock sth down , knock off , knock sth off (sth) , knock sb out
(Definition of knock verb from the Cambridge Learner’s Dictionary © Cambridge University Press)
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