- chiefly US Canadian an undergarment worn under a blouse or shirtBrit name: vest
WordReference Random House Learner's Dictionary of American English © 2026
un•der•shirt /ˈʌndɚˌʃɜrt/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Clothinga collarless, usually pullover undergarment for the upper body, usually of lightweight fabric with or without sleeves.
un•der•shirt
(un′dər shûrt′),USA pronunciation n.
- Clothinga 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.
- under- + shirt 1640–50
Collins Concise English Dictionary © HarperCollins Publishers::
undershirt /ˈʌndəˌʃɜːt/ n
'undershirt' also found in these entries (note: many are not synonyms or translations):