/ Dictionary / Index U unstop: Meaning and Definition of Find definitions for: un•stop Pronunciation: (un-stop'), [key] — -stopped, -stop•ping. to remove the stopper from: to unstop a bottle. to free from any obstruction; open: to unstop a sewer. to draw out the stops of (an organ). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unstick unstoppable Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language