undress
[verb]
Synonyms:
- strip, disrobe, shed, take off one's clothes
[noun]
Synonyms:
- nakedness, nudity

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Antonyms: dress, dress up

[TahlilGaran] English Synonym Dictionary ▲

I. un‧dress¹ /ʌnˈdres/ verb [intransitive and transitive]
[Word Family: noun: dress, dresser, dressing; adjective: dressed ≠ undressed, dressy; verb: dress ≠ undress]
to take your clothes off, or take someone else’s clothes off:
Matt undressed and got into bed.
Joe still needs an adult to undress him.

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In everyday English, people usually say get undressed rather than undress:
You can get undressed in here.

[TahlilGaran] Dictionary of Contemporary English ▲

II. undress² noun [uncountable]
formal when you are wearing few or no clothes:
Cindy was wandering about her room in a state of undress.

[TahlilGaran] Dictionary of Contemporary English ▲