foul ball foul • foul line · · · Info · Definitions · Antonyms · Characters · · foul ball · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) (baseball) a ball struck with the bat so that it does not stay between the lines (the foul lines) that define the width of the playing field. Synonyms: foul ball. · · Noun Definition 1 Antonyms · · · fair ball · · Antonym 0 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 f latin small letter f U+0066 l latin small letter l U+006C o latin small letter o U+006F u latin small letter u U+0075