on knocker

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

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