| 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) |
| mould |
| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, weaken, lessen, stain) |
| pollute(verb, decline, ruin, weaken, lessen) |
| putresce(verb, decline, weaken, lessen, degenerate) |
| rankle(verb, stop, end, pass, fall) |
| reach depths(verb, expression, decline, weaken, lessen) |
| sap(verb, decline, weaken, lessen, degenerate) |
| shrivel(verb, decline, weaken, lessen, degenerate) |
| sicken(verb, decline, weaken, lessen, degenerate) |
| slump(verb, decline, weaken, lessen, degenerate) |
| wane(verb, stop, end, decline, pass) |
| waste away(verb, expression, phrasal verb, decline, weaken) |
| weaken(verb, stop, end, decline, pass) |