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English definition of “boom”

boom

noun [C] (FILMING)    /buːm/
a long pole with a microphone on one end that is held above the actors so that it records their voices but cannot be seen by the people watching, used in television and film-makingCinema - general wordsPoles, rods, shafts and sticks
(Definition of boom noun (FILMING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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