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