knocker
noun /ˈnɒkə(r)/
/ˈnɑːkər/
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(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- [countable] (informal) a person who is always criticizing somebody/something
- knockers[plural] (taboo, slang) an offensive word for a woman’s breasts