| dry-rot(verb, decline, weaken, lessen, degenerate) |
| dwindle(verb, decline, fail, use, weaken) |
| fade(verb, decline, fail, use, weaken) |
| fail(verb, decline, weaken, lessen, degenerate) |
| get worse(verb, expression, decline, weaken, lessen) |
| go bad(verb, expression, decline, weaken, lessen) |
| go to pot(verb, expression, idiom, fail, weaken) |
| go to the dogs(verb, expression, idiom, decline, fail) |
| hit rock bottom(verb, expression, idiom, decline, weaken) |
| hit the skids(verb, expression, idiom, decline, fail) |
| lessen(verb, decline, fail, weaken, degenerate) |
| mildew(verb, decline, weaken, lessen, degenerate) |
| mold(verb, decline, weaken, lessen, degenerate) |
| molder(verb, decline, weaken, lessen, degenerate) |
| mortify(verb, decline, weaken, lessen, degenerate) |
| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, weaken, lessen, degenerate) |
| pollute(verb, decline, weaken, lessen, degenerate) |
| putrefy(verb, decline, weaken, lessen, idle) |
| putresce(verb, decline, weaken, lessen, degenerate) |