American English

Definition of dress up phrasal verb from the Oxford Advanced American Dictionary

 

dress up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to wear clothes that are more formal than those you usually wear There's no need to dress up—come as you are.

dress up

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dress somebody up

 
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to put on special clothes, especially to pretend to be someone or something different; to help somebody do this Kids love dressing up. dress-up clothes

dress something up

 
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to present something in a way that makes it seem better or different However much you try to dress it up, office work is not glamorous.
See the Oxford Advanced Learner's Dictionary entry: dress up