dress up is a verb meaning "put on special clothes to appear particularly appealing and attractive". It carries 5 recorded senses.
put on special clothes to appear particularly appealing and attractive
“She never dresses up, even when she goes to the opera”
“The young girls were all fancied up for the party”
make something appear superficially attractive
“The researcher tried to dress up the uninteresting data”
“Don't try to dress up the unpleasant truth”
Definitions, synonyms and semantic relations for dress up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.