/ Dictionary / Index U undid: Meaning and Definition of Find definitions for: un•did Pronunciation: (un-did'), [key] — v. pt. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undid (Thesaurus) undeveloped undies Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language