| go to pot(verb, expression, idiom, drop, decline) |
| decline(verb, reduce, fail, lower, slip) |
| degenerate(verb, drop, decline, reduce, fall) |
| deteriorate(verb, drop, decline, reduce, fall) |
| be impaired(verb, decline, weaken, lessen, degenerate) |
| become contaminated(verb, expression, decline, weaken, lessen) |
| blight(verb, decline, weaken, lessen, degenerate) |
| break up(verb, expression, phrasal verb, decline, weaken) |
| collapse(verb, decline, reduce, slip, weaken) |
| corrode(verb, decline, reduce, fail, lower) |
| crumble(verb, decline, fail, lower, weaken) |
| curdle(verb, decline, weaken, lessen, degenerate) |
| decompose(verb, decline, fail, lower, weaken) |
| defile(verb, decline, weaken, lessen, degenerate) |
| depreciate(verb, drop, decline, fall, fail) |
| discolor(verb, decline, weaken, lessen, degenerate) |
| disintegrate(verb, drop, decline, reduce, fall) |
| dissolve(verb, decline, weaken, lessen, degenerate) |
| dry-rot(verb, decline, weaken, lessen, degenerate) |
| dwindle(verb, drop, decline, fall, fail) |