/ Dictionary / Index S slippery slope: Meaning and Definition of Find definitions for: slip'pery slope' Pronunciation: [key] a dangerous and irreversible course: the slippery slope from narcotics to prison. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. slippery elm slippy 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