Pronunciation: (gus'ē), [key]
—v., -sied, -sy•ing. Informal.
to enhance the attractiveness of in a gimmicky, showy manner (usually fol. by up): a room gussied up with mirrors and lights.
to dress in one's best clothes (usually fol. by up): to gussy up for the ball.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.