thumb tack

thumbtack

[thuhm-tak]
noun
1.
a tack with a large, flat head, designed to be thrust into a board or other fairly soft object or surface by the pressure of the thumb.
verb (used with object)
2.
to attach or tack by means of a thumbtack.

Origin:
1880–85, Americanism; thumb + tack1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thumbtack (ˈθʌmˌtæk)
 
n
chiefly (US), (Canadian) Also called (esp in Britain): drawing pin a short tack with a broad smooth head for fastening papers to a drawing board, etc

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

thumbtack
tack with a broad, flat head which may be driven by pressure from the thumb, 1884, from thumb + tack.
Online Etymology Dictionary, © 2010 Douglas Harper
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