a person who applauds.
the tongue of a bell.
Slang. the tongue.
Usually, clappers. two flat sticks held between the fingers and struck rhythmically against each other to produce abrupt, sharp sounds.
Printing. a platen press.

1250–1300; Middle English claper. See clap1, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clapper (ˈklæpə)
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica


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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