Etymology
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undershirt (n.)

1640s, from under (adj.) + shirt (n.). Similar formation in North Frisian onnersjürt, Danish underskjorte. Old English had undersyrc (see sark (n.)).

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Definitions of undershirt

undershirt (n.)
a collarless men's undergarment for the upper part of the body;
Synonyms: singlet / vest
From wordnet.princeton.edu