/ Dictionary / Index D dassn't: Meaning and Definition of Find definitions for: dass•n't Pronunciation: (das'unt), [key] — Chiefly Northern U.S. Chiefly Northern U.S. contraction of dare not. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Dassin dast Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language