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clapboard2

[klap-bawrd, -bohrd] /ˈklæpˌbɔrd, -ˌboʊrd/
noun, Movies.
1.
a small board with a hinged stick attached that is clapped down at the beginning of the filming of a shot for use later in synchronizing sound and image in the editing of the film.
Also called clapper board, clapstick
[klap-stik] /ˈklæpˌstɪk/ (Show IPA)
.
Origin
clap1 + board
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for clapper board

clapboard

/ˈklæpˌbɔːd; ˈklæbəd/
noun
1.
  1. a long thin timber board with one edge thicker than the other, used esp in the US and Canada in wood-frame construction by lapping each board over the one below
  2. (as modifier) a clapboard house
verb
2.
(transitive) to cover with such boards
Word Origin
C16: partial translation of Low German klappholt, from klappen to crack + holt wood; related to Dutch claphout; see board
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for clapper board
clapboard
c.1520, partial transl. of M.Du. klapholt (borrowed into Eng. 14c.), from klappen "to fit" + L.Ger. holt "wood, board."
Online Etymology Dictionary, © 2010 Douglas Harper
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