Intensify, aggravate (7)
I believe the answer is:
inflame
I believe this is a double definition.
'intensify' is the first definition.
(thesaurus)
'aggravate' is the second definition.
(I know this)
(Other definitions for inflame that I've seen before include "Make (a situation) worse" , "Intensify, aggravate" , "Provoke to anger" , "Excite passionate feelings" , "Exacerbate" .)