stop watch

stopwatch

[stop-woch]
noun
a watch with a hand or hands that can be stopped or started at any instant, used for precise timing, as in races.

Origin:
1730–40; stop + watch

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World English Dictionary
stopwatch (ˈstɒpˌwɒtʃ)
 
n
a type of watch used for timing events, such as sporting events, accurately, having a device for stopping the hand or hands instantly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

stopwatch
also stop-watch, 1737, from stop + watch (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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