/gus"ee/ , v. , gussied, gussying . Informal.
v.t.
1. to enhance the attractiveness of in a gimmicky, showy manner (usually fol. by up ): a room gussied up with mirrors and lights.
v.i.
2. to dress in one's best clothes (usually fol. by up ): to gussy up for the ball.
[ 1935-40; of obscure orig. ]