noun, verb ·Rare ·Advanced level
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"A clapperboard marks the beginning of each take."
A device consisting of a board on which information about a film being recorded is noted, and a hinged piece which is brought down on the board with a clap at the start and end of each take of the film; it is used to synchronize picture and sound during editing.
A clapperboard marks the beginning of each take.
From clapper + board.