| divide(verb, break, study, determine, resolve) |
| dry-rot(verb, decline, weaken, lessen, degenerate) |
| dwindle(verb, decline, separate, weaken, lessen) |
| eat(verb, exhaust, drain, wear, erode) |
| fall to pieces(expression, idiom, break, collapse, split) |
| foul(hurt, dirty, corrupt, stain, muddy) |
| fragment(verb, break, help, beat, reduce) |
| gangrene |
| get worse(verb, expression, decline, weaken, lessen) |
| go(verb, decline, cease, decay, succumb) |
| go to pieces(verb, expression, idiom, beat, decline) |
| go to pot(verb, expression, idiom, decline, fail) |
| go to the dogs(verb, expression, idiom, decline, fail) |
| hit rock bottom(expression, idiom, decline, weaken, lessen) |
| hit the skids(verb, expression, idiom, decline, fail) |
| languish(verb, decline, weaken, degenerate, deteriorate) |
| lessen(verb, decline, fail, lower, weaken) |
| lose it(verb, expression, phrasal verb, decline, fail) |
| pejorate(verb, decline, weaken, lessen, degenerate) |
| pollute(verb, decline, hurt, harm, spoil) |