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English definition of “knocker”

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knocker

noun [C] uk   /ˈnɒk.ər/ us    /ˈnɑː.kɚ/

knocker noun [C] (METAL OBJECT)

( also doorknocker) a metal object attached to a door that visitors use to hit the door in order to attract attention

knocker noun [C] (CRITIC)

UK informal disapproving a person who is always criticizing someone or something

knocker noun [C] (BREASTS)

knockers [plural] slang a woman's breasts. Some people consider this word offensive.
(Definition of knocker from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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