knock, knock! Meaning in the Cambridge English Dictionary
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Meaning of “knock, knock!” in the English Dictionary

"knock, knock!" in British English

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knock, knock!

a way of ​describing the ​sound made when you ​hit a ​door. It is sometimes used as the first ​line of a ​joke.
(Definition of knock, knock! from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)