onesie - definition and synonyms

noun 

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/ˈwʌnzi/
singularonesie
pluralonesies
  1. 1
    [countable] a one-piece item of clothing made of soft material and covering the whole body. It is usually worn for sleeping or relaxing, especially by young people.
  2. 2

    Onesies

    trademark
    American a piece of clothing for a baby made of material that stretches and covers the whole body