clapper

[klap-er]
noun
1.
a person who applauds.
2.
the tongue of a bell.
3.
Slang. the tongue.
4.
Usually, clappers. two flat sticks held between the fingers and struck rhythmically against each other to produce abrupt, sharp sounds.
5.
Printing. a platen press.

Origin:
1250–1300; Middle English claper. See clap1, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clapper (ˈklæpə)
 
n
1.  a person or thing that claps
2.  a contrivance for producing a sound of clapping, as for scaring birds
3.  Also called: tongue a small piece of metal suspended within a bell that causes it to sound when made to strike against its side
4.  a slang word for tongue
5.  informal (Brit) go like the clappers, run like the clappers, move like the clappers to move extremely fast

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

clapper

musicalmusical instrument consisting of pieces of wood, bone, metal, or other sonorous substance either held in both hands or, fastened together, held in one hand, sometimes with a handle, and struck against each other. Clappers have been played throughout the world since ancient times, often with a ritual, warning, work-coordinating, or signaling function, rather than a musical one.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The first stroke of the clapper against its brazen wall shook the wood-work on
  which he was standing.
Often the singer keeps time with a pair of tiny bells and a small clapper in
  his hand.
With every strike of its clapper, one swimmer could come up for a gasp of air.
Clapper to hinge arm connection shall be such that the unit cannot be unscrewed
  by fluid flow.
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