Definition of dressing up in English:

dressing up

noun

  • 1The action or an act of putting on smart or elegant clothes, or smarter clothes than usual.

  • 2The putting on or wearing of a costume or fancy dress; the putting on (by a child) of various (adult) clothes as a game.

Origin

Early 16th century (in an earlier sense). From dressing + up, after to dress up.

Pronunciation

dressing up

/ˌdrɛsɪŋ ˈʌp/