ex ‧ hale /eksˈheɪl/ BrE AmE verb [intransitive and transitive]
[ Date: 1300-1400 ; Language: Latin ; Origin: exhalare , from halare 'to breathe' ]
to breathe air, smoke etc out of your mouth OPP inhale :
Take a deep breath, then exhale slowly.
—exhalation /ˌekshəˈleɪʃ ə n/ noun [uncountable and countable]