Definition of "undress" []

• To remove the clothing of; disrobe. (verb-transitive)
• To remove the bandages from (a wound, for example). (verb-transitive)
• To take off one's clothing. (verb-intransitive)
• Informal attire or uniform. (noun)
• Nakedness or partial nakedness. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Round the corner of an old building pour forth a company of soldiers in "undress" — very "undress" — costume, looking like a troop of navvies, though one-half may be men of fortune and position, who at home command their hundred servants and their carriages and horses, but here willingly, eagerly, shoulder their axe, and sally forth at dawn of day to throw up breastworks and erect batteries."
• "He was dressed in what might have been termed undress, and was most vigorous in his condemnation of foreigners."
• "Then Jack and Ruddy began to undress, that is, they took off everything but their pants."