| corrode(verb, decline, reduce, fail, lower) |
| corrupt(verb, decline, reduce, fail, lower) |
| crumble(decline, weaken, degenerate, deteriorate, decay) |
| debase(decline, weaken, degenerate, deteriorate, degrade) |
| debilitate(decline, weaken, degenerate, deteriorate, degrade) |
| declension |
| decompose(decline, weaken, degenerate, deteriorate, decay) |
| decrease(verb, drop, close, decline, reduce) |
| degeneracy |
| degrade(verb, decline, fail, lower, weaken) |
| depart(verb, drop, close, decline, reduce) |
| deprave(decline, reduce, weaken, degenerate, deteriorate) |
| depreciate(verb, decline, fail, lower, weaken) |
| die off(expression, drop, close, reduce, diminish) |
| dilapidate(verb, deteriorate) |
| diminish(verb, drop, close, decline, reduce) |
| disintegrate(verb, decline, reduce, fail, lower) |
| drain away(expression, drop, close, reduce, diminish) |
| draw back(verb, expression, close, reduce, diminish) |
| drop(verb, close, decline, reduce, withdraw) |