/ Dictionary / Index U untack: Meaning and Definition of Find definitions for: un•tack Pronunciation: (un-tak'), [key] — v.t. to unfasten (something tacked). to loose or detach by removing a tack or tacks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unswear untangle Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language