clapper board

/K L AE1 P ER0 B AO0 R D/
noun
  1. 1

    (film) Alternative form of clapperboard. [(film) 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.]

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