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English definition of “knock”

knock

noun [C]     /nɒk/
NOISE a sudden short noise made when something or someone hits a surface: a knock at/on the doorSounds made by objects, movement or impact
HIT a hit, sometimes causing damage or injury: a knock on the headHitting against objects accidentally and colliding
(Definition of knock noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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