Definition of undresses:
(v) :
(intransitive) To remove one’s clothing.
(v) :
(transitive) To remove the clothing of (someone).
(n) :
Now more specifically, a state of having few or no clothes on.
(v) :
(transitive, figuratively) To strip something off.
(v) :
To take the dressing, or covering, from.
(v) :
(reflexive, now rare) To remove one's clothing.