a collarless, usually pullover undergarment for the torso, usually of cotton and either sleeveless and low-cut or with sleeves, worn chiefly by men and children.

Origin of undershirt

First recorded in 1640–50; under- + shirt
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for undershirt



mainly US and Canadian an undergarment worn under a blouse or shirtBrit name: vest
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

Word Origin and History for undershirt

1640s, from under (adj.) + shirt (n.). Cf. North Frisian onnersjürt, Danish underskjorte.

Online Etymology Dictionary, © 2010 Douglas Harper