Definition of clapperboard noun from the Oxford Advanced Learner's Dictionary

 

clapperboard

 noun
noun
BrE BrE//ˈklæpəbɔːd//
 
; NAmE NAmE//ˈklæpərbɔːrd//
 
Film-making equipment
 
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a device that is used when making films/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 related entries: Film-making equipment
See the Oxford Advanced American Dictionary entry: clapperboard