Meaning

• To put on special or fancy clothes.

  "Everyone dressed up for the graduation ball."

• (often with 'as') To put on a costume portraying oneself as a particular type of character or well-known person.

  "We're having a party on Saturday, but you must dress up as a famous historical figure."

• To decorate; to prettify.

• To present in a favorable light.

  "You can dress up that proposal however you want, it's still going to go over like a lead balloon."