Definition of clapperboard noun from the Oxford Advanced American Dictionary

 

clapperboard

 noun
noun
NAmE//ˈklæpərˌbɔrd//
 
 
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a device that is used when making movies. It consists of two connected boards that are hit together at the start of a scene, and its purpose is to help to match the pictures with the sound.
See the Oxford Advanced Learner's Dictionary entry: clapperboard