/ Dictionary / Index C couldn't: Meaning and Definition of Find definitions for: could•n't Pronunciation: (kood'nt), [key] contraction of could not. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. could couldst Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language