The metal part inside a bell that swings and strikes the bell to make it ring, or someone who claps.
From Old English 'clappan' (to clap or throb), related to 'clap' with the agent suffix '-er' added. Originally meant anything that makes a striking or striking sound.
The clapper's simple design—just a weight on a string inside a hollow object—has been so effective that bells with clappers have rung for over 2,000 years, and the principle is still used in everything from wind chimes to alarm clocks.
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