intensify

Synonyms: accent accentuate add fuel add to aggrandize aggravate augment beef up boost brighten build up concentrate darken deepen emphasize enhance escalate exacerbate exalt heat up heighten increase intensate lighten magnify point pour it on quicken raise redouble reinforce rise rouse set off sharpen spike step up strengthen stress tone up whet

Antonyms: calm lower slow soothe weaken