Definition of Onesies™ noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈwʌnziz//
; NAmE NAmE//ˈwʌnziz//
(North American English)
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a piece of clothing for babies that covers the top half of the body and sometimes also the legs. It fastens between the legs. a pack of long-sleeved Onesies compare Babygro™