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Verb: underdress  ,ún-du(r)'dres
  1. Dress without sufficient warmth
    "She was underdressed for the hiking trip and suffered hypothermia"
  2. Dress informally and casually
    "On Fridays, employees can underdress";
    - dress down

Derived forms: underdressed, underdresses, underdressing

Type of: apparel, clothe, dress, enclothe, fit out, garb, garment, get dressed, habilitate [archaic], raiment [archaic], tog [informal]

Antonym: overdress