| decline(verb, break, reduce, fail, lower) |
| degenerate(verb, break, drop, decline, reduce) |
| descend(verb, break, decline, reduce, fail) |
| disintegrate(verb, break, drop, decline, reduce) |
| rot(verb, break, drop, decline, reduce) |
| sink(verb, break, drop, decline, reduce) |
| deteriorate(verb, drop, decline, reduce, fall) |
| retrograde(verb, drop, decline, fall, fail) |
| worsen(verb, break, drop, decline, reduce) |
| crumble(verb, break, decline, fail, lower) |
| decay(verb, break, drop, decline, reduce) |
| decompose(verb, break, decline, fail, lower) |
| go downhill(verb, expression, drop, decline, reduce) |
| go to pot(verb, expression, idiom, drop, decline) |
| lapse(verb, drop, decline, reduce, fall) |
| regress(verb, decline, reduce, weaken, degenerate) |
| relapse(verb, drop, reduce, fall, fail) |
| retrogress(verb, decline, reduce, fail, lower) |
| spoil(verb, break, decline, fail, lower) |
| taint(verb, break, collapse, split, undo) |