To dress up or make something look fancier or more decorated, usually followed by 'up'.
Possibly derived from the name Gussie, or from 'gusset' (a triangular fabric insert in clothing), though the origin is uncertain. It gained popularity in early 20th-century American English as slang for embellishing or overdressing.
English is full of verbs that emerged from names—'Sally' means to rush out, 'Jim' can mean to manipulate—showing how our slang turns everyday people into actions.
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