clapper Definition

one that claps: such as

the tongue of a bell

a mechanical device that makes noise especially by the banging of one part against another

a grayish-brown long-billed American rail (Rallus longirostris) that inhabits coastal marshes

a size of board for making staves and wainscoting

a narrow board usually thicker at one edge than the other used for siding

a pair of hinged boards one of which has a slate with data identifying a piece of film and which are banged together in front of a motion-picture camera at the start of a take to facilitate editing —called also clapper board