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

In the snap, the couple's baby daughter could be seen wearing a white onesie and holding onto her mom's finger. —Kayla Grant, People.com, 17 June 2025

Sporting a million-dollar smile, Blossom stars in the first photo while wearing a pink onesie and an LV scarf with pink bow socks. —Michael Saponara, Billboard, 16 June 2025

So, while in some ways the S&S supply chain resembles an e-commerce supply chain in terms of speed of delivery, an e-commerce order is smaller, typically involving picking onesies and twosies. —Steve Banker, Forbes.com, 13 June 2025

From soft, hypoallergenic onesies, to footed sleepers, hooded towels, beanies, and more. —Karissa Mitchell, Essence, 14 May 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