1. (v. t.) To render more intense; as, to intensify heat or cold; to intensify colors; to intensify a photographic negative; to intensify animosity.

2. (v. i.) To become intense, or more intense; to act with increasing power or energy.

accelerate accent accentuate accrue accumulate advance agent provocateur aggrandize aggravate amplify annoy appreciate augment balloon beef up bloat blow up boom breed broaden build up complicate concentrate condense consolidate crescendo deepen deteriorate develop double embitter emphasize enhance enlarge escalate exacerbate exaggerate exalt exasperate focus gain gain strength get ahead go up grow heat up heighten hop up hot up increase irritate jazz up key up magnify make acute make complex make worse mount multiply proliferate provoke quicken ramify redouble reinforce rise rouse run up sharpen shoot up snowball soup up sour spread step up strengthen stress swell triple wax whet widen worsen