| degeneracy(noun, drop, fall, failure, deterioration) |
| degeneration(noun, drop, decline, fall, failure) |
| degradation(noun, drop, decline, decrease, deterioration) |
| devaluation(noun, drop, decline, fall, decrease) |
| devolution(noun, drop, fall, failure, deterioration) |
| die down(expression, drop, cut, decline, reduce) |
| discolor(verb, decline, weaken, lessen, degenerate) |
| disintegrate(verb, decline, weaken, lessen, degenerate) |
| dissolve(verb, decline, weaken, lessen, degenerate) |
| downgrade(noun, verb, drop, cut, decline) |
| drop down(verb, expression, phrasal verb, drop, decline) |
| dry-rot(decline, weaken, lessen, degenerate, deteriorate) |
| dry up(expression, drop, cut, decline, reduce) |
| dwindling(noun, drop, cut, decline, fall) |
| eclipse |
| economic depression(expression, idiom) |
| evaporate(verb, drop, quiet, cut, decline) |
| failing(noun, drop, fall, failure, deterioration) |
| fall-off(noun, drop, decline, fall, position) |
| fall heavily |