| get worse(verb, expression, idiom, decline, slip) |
| moulder |
| slump(verb, drop, change, cut, decline) |
| vitiate(verb, cut, decline, hurt, reduce) |
| waste(verb, break, drop, cut, strong) |
| die(verb, stop, break, decline, fall) |
| age(verb, age, wear, older) |
| aggravate(verb, decline, degenerate, degrade, worsen) |
| atrophy(verb, decline, weaken, lessen, degenerate) |
| collapse(verb, change, beat, decline, reduce) |
| devolve |
| fall off(verb, expression, phrasal verb, drop, cut) |
| go bad(verb, expression, idiom, stop, end) |
| injure(verb, decline, hurt, reduce, destroy) |
| peter out(verb, expression, stop, drop, end) |
| relapse(verb, drop, decline, reduce, fall) |
| retrograde(verb, stop, drop, end, decline) |
| waste away(verb, expression, break, decline, fall) |
| wilt(verb, stop, break, end, decline) |
| abrade(verb, decline, diminish, use, weary) |