Worsen

Verb

 * 1)  To make worse.
 * 2) * The global warming has worsened the weather.
 * 3)  To become worse; to get worse.
 * 4) * The weather has worsened.

Antonyms

 * improve

Thesaurus
accommodate, adapt, adjust, agent provocateur, aggravate, alter, ameliorate, amplify, annoy, augment, be changed, be converted into, be renewed, better, blast, blight, bottom out, break, break up, build up, change, checker, chop, chop and change, come about, come around, come round, convert, corrupt, damage, debase, decline, deepen, deform, degenerate, degrade, denature, descend, deteriorate, deviate, dilapidate, disimprove, disintegrate, diverge, diversify, embitter, endamage, enhance, enlarge, exacerbate, exasperate, fall back, fit, flop, foul, get worse, grow worse, harm, haul around, heat up, heighten, hot up, humble, hurt, impair, improve, increase, injure, intensify, irritate, jibe, let down, lower, magnify, make acute, make worse, meliorate, mitigate, modify, modulate, mutate, overthrow, provoke, put back, qualify, re-create, realign, rebuild, reconstruct, redesign, refit, reform, regress, relapse, remake, renew, reshape, restructure, retrograde, retrogress, revamp, revive, ring the changes, rot, sharpen, shift, shift the scene, shuffle the cards, sicken, sink, slacken, slip back, sour, subvert, swerve, tack, taint, take a turn, turn, turn aside, turn into, turn the corner, turn the scale, turn the tables, turn the tide, turn upside down, undergo a change, vary, veer, warp, weaken, work a change