knocker

1. A device, usually hinged with a striking plate, used for knocking on a door.

   a device (usually metal and ornamental) attached by a hinge to a door

2. A person who knocks.

   a person who knocks (as seeking to gain admittance)

3. A critic; one who disparages.

   one who disparages or belittles the worth of something

4. (derogatory, informal)A person who knocks (denigrates) something.

   (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person

5. (usually plural, slang)A person's breast, especially if large.

6. A mechanical device in a pinball table that produces a loud percussive noise to signal that a free game has been earned.

7. (dated, slang)A person who is strikingly handsome or otherwise admirable; a stunner.

8. A large cockroach, especially Blaberus giganteus, of semitropical America, which is able to produce a loud knocking sound.

9. A large, boulder-shaped outcrop of bedrock in an otherwise low-lying landscape, chiefly associated with a mélange.

10. (slang)One who defaults on payment of a wager.

11. (slang)A gun.

12. (slang)An undercover policeman.

1. A law without a penalty is like a bell without a knocker.

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