in birthday suit

in (one's) birthday suit

euphemism Completely naked. Alludes to the fact that one is born without clothing. I have a recurring nightmare where I'm walking through school in my birthday suit. As kids, we had no problem going swimming together in our birthday suits. I forgot a towel, so I had to run down the dorm hallway in my birthday suit after my shower! How mortifying!

See also: birthday, suit

Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.

*in one's birthday suit

Fig. naked; nude. (In the "clothes" in which one was born. *Typically: be ~; get [into] ~.) I've heard that John sleeps in his birthday suit. We used to go down to the river and swim in our birthday suits.

See also: birthday, suit

McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.