exacerbate
Concise Oxford English Dictionary © 2008 Oxford University Press:
exacerbate /ɪgˈzasəbeɪt, ɛkˈsas-/
▶verb make (something bad) worse.
– derivatives
exacerbation noun.
exacerbation noun.
– origin C17 (earlier (ME) as exacerbation, in the sense ‘provocation to anger’): from L. exacerbat-, exacerbare ‘make harsh’.
'exacerbate' also found in these Oxford entries:

