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English definition of “dress up”

dress up

phrasal verb with dress     /dres/ verb
to put on formal clothes for a special occasion: You don't need to dress up to go to the pub - jeans and a T-shirt will do.Putting clothes onDecorating or making something attractive to put on special clothes in order to change your appearance: Small children usually love dressing up in their mothers' clothes. He dressed up as a cowboy for the party.Putting clothes onHiding and disguising
(Definition of dress up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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