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Definition of knocker noun from the Oxford Advanced Learner's Dictionary

knocker

noun
 
/ˈnɒkə(r)/
 
/ˈnɑːkər/
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  1. (also door knocker)
    [countable] a metal object attached to the outside of the door of a house, etc. that you hit against the door to attract attentionTopics Houses and homesc2
  2. [countable] (informal) a person who is always criticizing somebody/something
  3. knockers
    [plural] (taboo, slang) a woman’s breasts
See knocker in the Oxford Advanced American Dictionary

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