Noun
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a device (usually metal and ornamental) attached by a hinge to a door
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either of two soft fleshy milk-secreting glandular organs on the chest of a woman
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one who disparages or belittles the worth of something
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a person who knocks (as seeking to gain admittance)
"open the door and see who the knocker is"
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(Yiddish) a big shot who knows it and acts that way
a boastful immoderate person