gus ‧ sy /ˈɡʌsi/ BrE AmE verb ( past tense and past participle gussied , present participle gussying , third person singular gussies )
[ Date: 1900-2000 ; Origin: Perhaps from gussie 'weak or stupid man' (19-20 centuries) , from the male or female name Gussie ]
gussy somebody/something ↔ up phrasal verb American English informal
to make someone look attractive by dressing them in their best clothes, or to make something look attractive by decorating it:
All the girls will be gussied up for the party.