lights-out light source • light speed · · · Info · Definitions · Synonyms · Characters · · lights-out · · Text Common · · Latin · · Scripts 10 · · Length 2 · · Syllables Definitions · · · (noun) a prescribed bedtime. · · Noun Definition 1 (noun) (military) signal to turn the lights out. Synonyms: taps. · · Noun Definition 2 Synonyms · · · taps · · Synonym 1 Characters · · - hyphen-minus U+002D g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075