| be impaired(verb, decline, weaken, lessen, degenerate) |
| become contaminated(verb, expression, decline, weaken, lessen) |
| blight(verb, decline, weaken, lessen, degenerate) |
| collapse(verb, decline, weaken, lessen, degenerate) |
| corrode(verb, decline, weaken, lessen, degenerate) |
| decline(verb, stop, end, pass, fall) |
| defile(verb, decline, ruin, weaken, lessen) |
| degenerate(verb, stop, end, decline, pass) |
| depreciate(verb, decline, weaken, lessen, degenerate) |
| discolor(verb, decline, weaken, lessen, degenerate) |
| dissolve(verb, decline, weaken, lessen, degenerate) |
| dry-rot(verb, decline, weaken, lessen, degenerate) |
| dwindle(verb, stop, end, decline, pass) |
| fade(verb, stop, end, decline, pass) |
| get worse(verb, expression, decline, weaken, lessen) |
| go to seed(verb, expression, idiom, decline, weaken) |
| go to the dogs(verb, expression, idiom, decline, weaken) |
| hit rock bottom(verb, expression, idiom, decline, weaken) |
| hit the skids(verb, expression, idiom, decline, weaken) |
| lessen(verb, decline, weaken, degenerate, deteriorate) |