thumbtack

[ thuhm-tak ]
/ ˈθʌmˌtæk /

noun

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)

to attach or tack by means of a thumbtack.

Origin of thumbtack

An Americanism dating back to 1880–85; thumb + tack1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for thumbtack

thumbtack

/ (ˈθʌmˌtæk) /

noun

mainly US and Canadian a short tack with a broad smooth head for fastening papers to a drawing board, etcAlso called (esp in Britain): drawing pin

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