nounchiefly North American
An undergarment worn under a shirt; a vest.
- He'd always wear undershirts under his dress shirts, and cuff links in his French sleeves.
- The older man, dressed in an old polo shirt over an undershirt, glanced blearily at his son.
- He was dressed in a light blue flannel shirt over a white undershirt and navy blue jeans.
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Line breaks: under|shirt
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