noun
a person or thing that claps, such as a device used to make noise by striking together
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The clappers of the bell rang out as the clock struck midnight.
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When the concert ended, everyone was clapping their hands like crazy, like a bunch of clappers.
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I heard that new movie is a real clapper, we should go see it.
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Her heart was racing like the clappers when she saw him walk into the room.