poison, fell, dismiss, put down, demoralize, demean, decompose, prostitute, strong, fail, drop off, fall, drop down, discharge, strike down, warp, throw off, canker, corrupt, taint, pretermit, bastardize, swing, cheapen, spend, languish, throw, neglect, devolve, deprave, break down, crumble, waste, flag, subvert, shake off, pervert, overlook, leave out, spoil, drip, expend, weaken, send away, escalate, descend into, drop, throw away, miss, thrive, omit, spiral, better, fizzle, overleap, vitiate, degrade, molder, cast, send packing, retrograde, cut down, dribble, lessen, debauch, rot, slip into, knock off, go down, profane, cast off, return, disintegrate, turn, flatten, descend, increase, set down, deepen, abase, shed, pass, dangle, unload
age (part of speech: verb)
deteriorate (part of speech: verb)
degenerate, dilapidate, sink, fall apart, fade, go downhill, collapse, moulder, putrefy, slump, worsen, regress, ebb, slip, relapse, get worse, wilt, downgrade, retrogress, slide, tergiversate, wane, wither, revert, atrophy, lapse, decay
- Even if left without care the ground did not deteriorate, but the products took on the character of the times and gradually improved. - "Daybreak: A Romance of an Old World", James Cowan.
- During the heat of summer, however, they deteriorate. - "The Pecan and its Culture", H. Harold Hume.
- The more civilized they grow the more they will let their bodies deteriorate. - "This Simian World", Clarence Day Jr..