gutturalize in British English
or gutturalise (ˈɡʌtərəˌlaɪz)
verb1. (transitive) phonetics to change into a guttural speech sound or pronounce with guttural articulation or pharyngeal constriction
2. to speak or utter in harsh raucous tones
Derived forms
gutturalization (ˌgutturaliˈzation) or gutturalisation (ˌgutturaliˈsation) noun