onesie

noun

one·​sie ˈwən-zē How to pronounce onesie (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 With the Tokyo photo call now generating buzz around the world, Black’s Bowser onesie moment signals that the energy surrounding The Super Mario Galaxy Movie is only building. Hanna Wickes, Miami Herald, 27 Mar. 2026 The man literally showed up in a full Bowser onesie at a photo call for The Super Mario Galaxy Movie in Tokyo on March 26, 2026 — and the internet’s obsession with this man just leveled up again. Hanna Wickes, Sacbee.com, 27 Mar. 2026 The child was wearing a yellow onesie and was wrapped in a blue blanket. Sydney Page The Washington Post, Arkansas Online, 15 Mar. 2026 See All Example Sentences for onesie

Word History

Etymology

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

First Known Use

1983, in the meaning defined at sense 1

Time Traveler
The first known use of onesie was in 1983

Browse Nearby Words

Cite this Entry

“Onesie.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/onesie. Accessed 29 Mar. 2026.

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