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Knocker
01
a device (usually metal and ornamental) attached by a hinge to a door
02
either of two soft fleshy milk-secreting glandular organs on the chest of a woman
03
one who disparages or belittles the worth of something
04
a person who knocks (as seeking to gain admittance)
05
(Yiddish) a big shot who knows it and acts that way; a boastful immoderate person