hoars·en \ˈhōrsən, ˈhȯr-, ˈhōəs-, ˈhȯ(ə)s-\verb (hoarsened ; hoarsened ; hoarsening \-s(ə)niŋ\ ; hoarsens) transitive verb : to make hoarse < it agitated their bodies and hoarsened their voices — Walter O'Meara > intransitive verb : to become hoarse < the deep voice hoarsened — E.C.Marston >