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general::
undress/get undressed
to take off all your clothes, especially before going to bed. Get undressed is the usual phrase to use in everyday English:
• She got undressed and went to bed. • Em felt uncomfortable undressing in front of other people.
take something off/remove
to remove a piece of clothing. Remove is more formal than take off:
• 'It’s warm in here,' said Michael, taking off his jacket. • Take your shoes off before you come in. • Police officers told him to remove his clothes.
strip (off)
to take off all or some of your clothes – used especially when you do this quickly, when someone has ordered you to do it, or in a way that is deliberately sexually exciting:
• Ben stripped off and got into the shower. • She stripped off her clothes and lay on the bed. • The women in the club screamed and clapped as the male dancers began to strip.
get changed
to take off your clothes and put on different clothes:
• The boys ran up the stairs to get changed. • I’ll be ready in a second, I just have to get changed.
undo
to open a piece of clothing that is fastened:
• He started to undo his shirt. • Amy was struggling to undo her belt.
Longman-Thesaurus