dress up in WordNet English dictionary

1. put a caparison on
   "caparison the horses for the festive occasion"
   caparison  bard  barde  dress up 
   
2. dress in a costume
   "We dressed up for Halloween as pumpkins"
   costume  dress up 
   
3. 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"
   overdress  dress up  fig out  fig up  deck up  gussy up  fancy up  trick up  deck out  trick out  prink  attire  get up  rig out  tog up  tog out 
   
4. dress in a certain manner
   "She dresses in the latest Paris fashion"; "he dressed up in a suit and tie"
   dress  dress up 
   
5. make something appear superficially attractive
   "The researcher tried to dress up the uninteresting data"; "Don't try to dress up the unpleasant truth"
   dress up  window-dress 
   

dress up in English Wiktionary