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

Golden was in a onesie with footballs printed on her legs and both feet — a sweet nod to her dad. —Charna Flam, People.com, 28 Feb. 2025

Kennedy was questioned by Vermont Senator Bernie Sanders during his confirmation hearing about his opposition to childhood vaccinations, highlighting infant onesies with anti-vax slogans sold by Children's Health Defense, a company founded by the now Health and Human Services secretary. —Dan Perry, Newsweek, 13 Feb. 2025

After Roman was born, then came the Eagles onesies, pajamas and watching games at home. —Frank Langfitt, NPR, 8 Feb. 2025

It’s designed to look like an adult jersey, only in onesie form. —Christopher Murray, Fox News, 6 Feb. 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