KNOCKER

Definition

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