/ Dictionary / Index S slip-up: Meaning and Definition of Find definitions for: slip-up Pronunciation: (slip'up"), [key] — n. a mistake, blunder, or oversight: Several slip-ups caused a delay in the delivery of the books. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: slip-up (Thesaurus) slip trailing slipware 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