/ Dictionary / Index S slow-up: Meaning and Definition of Find definitions for: slow-up Pronunciation: (slō'up"), [key] — n. a delay or retardation in progress or activity; slowdown. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: slow-up (Thesaurus) slow-twitch slow virus Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language