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plural clapperboards
(film) A device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production. examples
third-person singular simple present clapperboards, present participle clapperboarding, simple past and past participle clapperboarded
To use a clapperboard, especially to clap it to start a film take. examples