boom out boom mainsail • boom pole · · · Info · Definitions · Synonyms · Characters · · boom out · · Text Common · · Latin · · Scripts 8 · · Length 2 · · Syllables Definitions · · · (verb) make a deep hollow sound. Synonyms: boom, boom out. Example: "Her voice booms out the words of the song." · · Verb Definition 1 Synonyms · · · boom · · Synonym 1 Characters · · space U+0020 b latin small letter b U+0062 m latin small letter m U+006D o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075