exacerbate
Pronunciation: /ɪgˈzasəbeɪt, ɛkˈsas-/
verb

Origin:
mid 17th century: from Latin exacerbat- 'made harsh', from the verb exacerbare, from ex- (expressing inducement of a state) + acerbus 'harsh, bitter'. The noun exacerbation (late Middle English) originally meant 'provocation to anger'