WordNet (r) 3.0 (2006):
underdress v 1: dress without sufficient warmth; "She was underdressed for the hiking trip and suffered hypothermia" [ant: overclothe, overdress] 2: dress informally and casually; "On Fridays, employees can underdress" [syn: dress down, underdress] [ant: attire, deck out, deck up, dress up, fancy up, fig out, fig up, get up, gussy up, overdress, prink, rig out, tog out, tog up, trick out, trick up]