Share this entry

onesie Line breaks: one¦sie
Pronunciation: /ˈwʌnzi/

Definition of onesie in English:


1A loose-fitting one-piece leisure garment covering the torso and legs: I’d had a bath and was in my onesie ready to settle down for yet another reality TV marathon
More example sentences
  • The winter months have set in and all I want to do is kick back in front of the roaring fire whilst sporting my brand new onesie.
  • I have recently jumped on the band wagon and got myself a onesie.
  • Every night I came home from teaching, put on my onesie, wrapped myself in a duvet, and drank tea on the couch.
2North American A one-piece close-fitting lightweight garment worn by a young child, usually having sleeves but leaving the legs uncovered and fastening with press studs at the crotch.
Example sentences
  • By the time they bring their new little family member home, they've taken classes, read a library's worth of books, and bought enough onesies to fill an entire dresser.
  • The onesies, in sets of three, will be decorated with a peace symbol, a heart, and a happy face: peace, love, and happiness.
  • Onesies are very practical clothing for babies to wear.


1980s: from Onesies, a proprietary name for a garment of this type, based on one + -sy.

Definition of onesie in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources