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

… pole-vaulter Holly Bradshaw wore a onesie rather than a crop top and bikini to win her bronze …

—Vanessa Friedman

Examples of onesie in a Sentence

Recent Examples on the Web

Kamoun held a little tennis racket while Jabeur held a tiny onesie. —Georgia Slater, PEOPLE, 22 Apr. 2026

Terrence was dressed in a giant yellow onesie—a Pokémon. —Danielle Parker, CBS News, 14 Apr. 2026

On her Instagram story, the new grandmother shared pictures of her grandchild wearing rabbit ears and an Easter onesie, one against a background of plastic eggs and another under a tree decorated with Easter eggs. —Catherine Messier, The Providence Journal, 6 Apr. 2026

Whether that means rewriting a love ballad in a couple of days or suiting up in a onesie for a press event on the other side of the world, the commitment never wavers. —Hanna Wickes, Kansas City Star, 27 Mar. 2026

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