| slump(verb, decline, weaken, lessen, degenerate) |
| wane(verb, decline, weaken, lessen, degenerate) |
| wither(verb, break, decline, sink, degenerate) |
| atrophy(verb, decline, degenerate, deteriorate, wane) |
| be impaired(decline, weaken, lessen, degenerate, deteriorate) |
| become contaminated(expression, decline, weaken, lessen, degenerate) |
| besmirch(verb, hurt, dirty, corrupt, stain) |
| blight(verb, decline, hurt, ruin, damage) |
| break(verb, collapse, split, fragment, disintegrate) |
| contaminate(verb, dirty, stain, degrade, debase) |
| deprave(verb, hurt, damage, harm, dirty) |
| depreciate(decline, ruin, harm, weaken, lessen) |
| dilapidate(verb, break, collapse, split, undo) |
| discolor(verb, decline, hurt, harm, spoil) |
| dry-rot(decline, weaken, lessen, degenerate, deteriorate) |
| dwindle(decline, weaken, lessen, degenerate, deteriorate) |
| fail(decline, weaken, lessen, degenerate, deteriorate) |
| fall to pieces(expression, idiom, break, collapse, split) |
| ferment(verb, dull, spoil, decay, sour) |
| gangrene |