/ Dictionary / Index F foul-up: Meaning and Definition of Find definitions for: foul-up Pronunciation: (foul'up"), [key] — n. Informal. a condition of difficulty or disorder brought on by inefficiency, stupidity, etc. failure of a mechanical part to operate correctly. a person who habitually makes mistakes; bungler. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: foul-up (Thesaurus) foul tip foumart Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language