knocker

knock +‎ -er

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• Rhymes: -ɒkə(r)

knocker (plural knockers)

1. A device, usually hinged with a striking plate, used for knocking on a door.
2. A person who knocks.
   • 1963, Patrick Anderson, The Character Ball: Chapters of Autobiography (page 220)

     He was a loud knocker. Despite my usual timidity, after a bit I opened the door.

3. (informal, derogatory) A person who knocks (denigrates) something.
4. (slang, usually in the plural) A woman's breasts.
5. (especially Cardigan, in South Wales, archaic) A dwarf, goblin, or sprite imagined to dwell in mines and to indicate the presence of ore by knocking. [18th to 19th c.]
6. (pinball) A mechanical device in a pinball table that produces a loud percussive noise.
   • 1963, Harper's magazine (volume 226)

     A good game needs color, lights, bells, gongs, and knockers, all to assure the player he is making progress […]

7. (dated, slang) A person who is strikingly handsome or otherwise admirable; a stunner.
8. A large cockroach, especially Blaberus giganteus, of semitropical America, which is able to produce a loud knocking sound.
9. (geology) A large, boulder-shaped outcrop of bedrock in an otherwise low-lying landscape, chiefly associated with a mélange.

• (a woman's breasts): See also Thesaurus:breasts