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Noun: undervest  'ún-du(r),vest
Usage: Brit (N. Amer: undershirt)
  1. A collarless undergarment for the upper part of the body
    "He wore a white cotton undervest beneath his dress shirt";
    - singlet [Brit], vest [Brit], undershirt [N. Amer]

Derived forms: undervests

Type of: undergarment, unmentionable