| decay(verb, decline, fail, diminish, use) |
| deteriorate(verb, decline, fail, use, weaken) |
| rot(verb, decline, fail, weaken, lessen) |
| stagnate(verb, decline, weaken, idle, deteriorate) |
| 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, weaken, lessen, degenerate) |
| corrode(verb, decline, use, weaken, lessen) |
| crumble(verb, decline, weaken, lessen, degenerate) |
| curdle(verb, decline, weaken, lessen, degenerate) |
| decline(verb, fail, weaken, lessen, idle) |
| decompose(verb, decline, weaken, lessen, degenerate) |
| defile(verb, decline, weaken, lessen, degenerate) |
| degenerate(verb, decline, fail, weaken, lessen) |
| depreciate(verb, decline, fail, weaken, lessen) |
| discolor(verb, decline, weaken, lessen, degenerate) |
| disintegrate(verb, decline, fail, weaken, lessen) |
| dissolve(verb, decline, weaken, lessen, degenerate) |