intensify
add fuel to the flames (informal) add to, aggravate, augment, boost, concentrate, deepen, emphasize, enhance, escalate, exacerbate, fan the flames of, heighten, increase, magnify, quicken, redouble, reinforce, set off, sharpen, step up (informal) strengthen, whet
Antonyms
damp down, decrease, dilute, diminish, dull, lessen, minimize, weaken