foot fault footfault • foot-firm · · · Info · Definitions · Characters · · foot fault · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) a fault that occurs when the server in tennis fails to keep both feet behind the baseline. Synonyms: footfault. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 f latin small letter f U+0066 l latin small letter l U+006C o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075