exhaleex‧hale /ɛksˈheɪl, ɛkˈseɪl/ ●○○ verb [intransitive, transitive] to breathe air, smoke, etc. out of your mouth SYN breathe out: Take a deep breath, then exhale slowly.THESAURUSbreathe, take a breath, inhale, pant, wheeze► see thesaurus at breathe