clapboard
noun
clap·board
ˈkla-bərd
ˈkla(p)-ˌbȯrd
1
archaic
: a size of board for making staves and wainscoting
2
: a narrow board usually thicker at one edge than the other used for siding
3
ˈklap-ˌbȯrd
: 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
clapboard
transitive verb
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Merriam-Webster unabridged
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