onesie

noun

one·​sie ˈwən-zē 

plural onesies

1

: a bodysuit for an infant having a snap closure at the crotch and not covering the legs

… her husband, Prince William, gratefully accepted a onesie labeled "Daddy's Little Co-Pilot" from a well-wisher …

—Michelle Tauber et al.

2

: a one-piece garment for adults usually with long sleeves and pants and sometimes with a hood

All eyes were on Pharrell Williams' wife, Helen Lasichanh, during the Met Gala on May 1, but it was for all the wrong reasons. We were hoping Helen would show off her amazing post-baby body after birthing triplets, but instead, she covered her body in a giant red onesie that some Twitter users were comparing to the red Teletubbie!

—Christopher Rogers

Examples of onesie in a Sentence

Recent Examples on the Web

Wearing onesies and laying down in their crib, the triplet girls each have their own blanket, but there is a problem. —Daniella Gray, MSNBC Newsweek, 23 May 2025

The night of the incident, Guilfoyle was walking down a road near Brookville in single-digit temperatures holding his 23-month-old daughter, who was wearing only a onesie, when a snowplow driver spotted him, according to the Cincinnati Enquirer. —Jennifer Rodriguez, Kansas City Star, 14 May 2025

Elliot was dressed in a white and brown onesie with a bunny and two carrots embroidered on top of a pocket for the festive photo shoot. —Kayla Grant, People.com, 11 May 2025

Alo’s dresses and onesies are made for those grab-and-go travel moments—think: sightseeing in Santorini, boarding a long-haul flight, or heading straight from pilates to brunch. —Rosie Marder, Travel + Leisure, 28 Apr. 2025

Word History

Etymology

one entry 1 + -sie (after the trademark Onesies)

First Known Use

1983, in the meaning defined at sense 1

Rhymes for onesie

• breezy
• cheesy
• easy
• queasy
• sleazy
• wheezy
• marchese
• speakeasy
• uneasy