accelerate agent provocateur aggravate agitate alienate amplify annoy antagonize arouse augment beef up blow the coals blow up build up complicate concentrate condense consolidate deepen deteriorate double embitter enhance enlarge envenom estrange exacerbate exaggerate exasperate excite fan fan the flame feed the fire ferment fire foment heat heighten hop up hot up impassion incense incite increase inflame infuriate instigate intensify irritate jazz up key up madden magnify make acute make complex make worse nettle pique provoke put up to rally ramify redouble reinforce set against set at odds set on sharpen sic on soup up sour step up stir the embers stir up strengthen tickle triple whet whip up work up worsen