| pejorate(verb, decline, weaken, lessen, degenerate) |
| perish(verb, decline, weaken, lessen, degenerate) |
| petrify(verb, close, set, fix, settle) |
| pollute(verb, decline, weaken, lessen, degenerate) |
| precipitate(verb, close, set, fix, settle) |
| putresce(verb, decline, weaken, lessen, degenerate) |
| reach depths(expression, decline, weaken, lessen, degenerate) |
| reinforce(verb, close, set, fix, settle) |
| sap(verb, decline, weaken, lessen, degenerate) |
| shrivel(verb, decline, weaken, lessen, degenerate) |
| sicken(verb, decline, pain, weaken, lessen) |
| sink(verb, decline, weaken, lessen, degenerate) |
| slump(verb, decline, weaken, lessen, degenerate) |
| starch(verb, close, set, fix, settle) |
| suppurate(verb, decline, weaken, lessen, degenerate) |
| turn sour(noun, expression, idiom, change, turn) |
| wane(verb, decline, weaken, lessen, degenerate) |
| waste away(expression, decline, weaken, lessen, degenerate) |
| wear away(expression, decline, weaken, lessen, degenerate) |
| addle(verb, decay, taint, rot, decompose) |