/ Dictionary / Index S suss: Meaning and Definition of Find definitions for: suss Pronunciation: (sus), [key] to investigate or figure out (usually fol. by out). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Susquehanna Sussex 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