get worse

atrophy corrode decompose degenerate discolor disintegrate dissolve dwindle fade lessen mortify pollute rot shrivel wane wither

blight collapse curdle decline defile depreciate dry-rot fail mildew mold molder perish putrefy sap sicken sink slump spoil suppurate turn weaken

be impaired become contaminated break up go bad go to seed go to the dogs hit rock bottom hit the skids pejorate putresce reach depths waste away wear away

brighten build color combine develop enlarge expand extend grow improve increase put together raise strengthen unite

ascend help make well prosper rise

flourish germinate ripen

aggravate damage decline depress deteriorate exacerbate impair lower

corrode degenerate descend disintegrate retrograde retrogress rot sink

fall off go downhill

aid comfort help improve increase make happy raise rise soothe

build grow