aggravate agitate alienate arouse blow the coals come between disaffect disunite divide estrange excite fan fan the flame feed the fire ferment fire foment heat heat up impassion incense incite inflame instigate irritate light the fuse make trouble nettle pique pit against provoke put up to rally separate set against set at odds set at variance set on sow dissension stir the embers stir up stir up trouble tickle whet whip up work up