| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, weaken, lessen, stain) |
| pollute(verb, decline, ruin, weaken, lessen) |
| putresce(verb, decline, weaken, lessen, degenerate) |
| 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) |
| wear away(verb, expression, phrasal verb, stop, end) |
| wither(verb, stop, end, decline, pass) |
| addle(verb, decay, taint, decompose) |
| taint(verb, dull, spoil, stain, better) |
| become tainted(verb, expression, spoil, decay, taint) |
| become useless(verb, expression, spoil, decay, taint) |
| fall apart(expression, decay) |
| go moldy(expression, decay, decompose) |