knocker

[nok-er]
noun
1.
a person or thing that knocks.
2.
a hinged knob, bar, etc., on a door, for use in knocking.
3.
Informal. a persistent and carping critic; faultfinder.
4.
Slang: Vulgar. a female breast.
Idioms
5.
on the knocker, British Slang. canvassing or selling door-to-door.

Origin:
1350–1400; Middle English; see knock, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
knocker (ˈnɒkə)
 
n
1.  an object, usually ornamental and made of metal, attached to a door by a hinge and used for knocking
2.  informal a person who finds fault or disparages
3.  slang (usually plural) a female breast
4.  a person or thing that knocks
5.  informal (Austral), (NZ) on the knocker promptly; at once: you pay on the knocker here

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Knocking someone down in such harsh terms without any explanation or definitions does not elevate the knocker.
There was no doorbell or knocker outside the outer door.
The door has elaborate curling strap hinges and other ornamental hardware including a metal knocker in the shape of a human hand.
The bottom edge is called a knee-knocker but really it should be called an ankle smasher or foot catcher.
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