I. |ən+ verb
Etymology: un- (II) + dress, v.
transitive verb
1. : to remove the clothes or covering of : divest , strip
undressed himself and went to bed
2. obsolete : to undo the dressing of (the hair) : take down : unbind
3. : to free or deprive of concealment or privacy : expose
asked to undress his past — Eugene Gressman
intransitive verb
: to take off one's clothes : disrobe
II. noun
Etymology: un- (I) + dress, n.
1. : informal dress: as
a. : a loose robe or dressing gown for lounging or informal wear
b. : ordinary dress — distinguished from full dress
c. : undress uniform
2. : nakedness , nudity
the usual models in differing degrees of undress — New Orleans States
III. adjective
1. : of, relating to, or worn as informal attire
made the engine-room staff change from dungarees to undress blues before going to chow — Fletcher Pratt
2. : marked by relaxed informality or unpretentiousness
the undress style which a man keeps for his intimates — John Buchan
look at the undress side of things — New Yorker