/ Dictionary / Index D decongest: Meaning and Definition of Find definitions for: de•con•gest Pronunciation: (dē"kun-jest'), [key] — v.t. to diminish or end the congestion of. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decondition decongestant Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language