clapboard

Etymology 1

From Middle English clapholt, from Middle Low German or Middle Dutch klapholt. The part "holt" was later calqued to "board".

noun

1. A narrow board, usually thicker at one edge than the other, used as siding for houses and similar structures of frame construction.
   Its exterior is covered with clapboards stained dark brown. September 28, 2007, Wendy Moonan, New York Times
2. (uncountable) Such boards, arranged horizontally and overlapping with thick edge down, collectively, as siding.
3. (archaic, UK) An oak board of a size used for barrel staves.

verb

1. To cover with clapboards.
   to clapboard the sides of a house

Etymology 2

clap + board

noun

1. (film) A clapper board; a device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production.