| debilitate(verb, decline, weaken, degenerate, deteriorate) |
| decompose(verb, decline, fail, lower, weaken) |
| decrease(verb, drop, fall, fail, diminish) |
| degrade(verb, decline, weaken, degenerate, deteriorate) |
| deprave(verb, decline, fail, lower, weaken) |
| depreciate(verb, drop, decline, fall, fail) |
| descend(verb, decline, fail, lower, weaken) |
| diminish(verb, drop, fall, fail, return) |
| disintegrate(verb, drop, decline, fall, fail) |
| dissipate |
| dogs |
| droop(verb, drop, fall, fail, diminish) |
| drop(verb, fall, fail, return, lower) |
| dwindle(verb, drop, fall, fail, diminish) |
| ebb(verb, drop, decline, fall, fail) |
| fade(verb, drop, decline, fall, fail) |
| fall apart(verb, expression, decline, degenerate, deteriorate) |
| fall off(verb, expression, phrasal verb, drop, fall) |
| flag(verb, drop, decline, fall, fail) |
| fold |