Definition of 'knocker'

Noun

1. (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person
2. a person who knocks (as seeking to gain admittance); "open the door and see who the knocker is"
3. one who disparages or belittles the worth of something
      Synonyms: detractor disparager depreciator
4. either of two soft fleshy milk-secreting glandular organs on the chest of a woman
      Synonyms: breast bosom boob tit titty
5. a device (usually metal and ornamental) attached by a hinge to a door
      Synonyms: doorknocker rapper

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