clapperboard clapperboard /ˈklæp.ə.bɔːd/ aep /-ɚ.bɔːrd/ noun [C] (US USUALLYclapboard) specialized ► F0 a device, used by people making films, that consists of a board with two parts that are hit together at the start of filmingThesaurus+: ↑Cinema - general words