/ Dictionary / Index O overfill: Meaning and Definition of Find definitions for: o•ver•fill Pronunciation: (ō"vur-fil'), [key] — v.t. to fill too full, so as to cause overflowing. —v.i. to become too full. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: overfill (Thesaurus) overfeed overfish Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language