| discoloration |
| disfigure(verb, break, hurt, ruin, damage) |
| disintegrate(verb, break, decline, hurt, ruin) |
| dissolve(verb, dull, decline, weaken, lessen) |
| distort(verb, ruin, damage, spoil, blemish) |
| dot |
| dry-rot(verb, decline, weaken, lessen, degenerate) |
| dull(verb, dirty, corrupt, stain, color) |
| dwindle(verb, decline, weaken, lessen, degenerate) |
| dye(verb, stain, color, blemish, fade) |
| fail(verb, decline, weaken, lessen, degenerate) |
| gash |
| get worse(expression, decline, weaken, lessen, degenerate) |
| go bad(expression, decline, weaken, lessen, degenerate) |
| go to seed(expression, idiom, decline, weaken, lessen) |
| go to the dogs(expression, idiom, decline, weaken, lessen) |
| hit rock bottom(expression, idiom, decline, weaken, lessen) |
| hit the skids(expression, idiom, decline, weaken, lessen) |
| hurt(verb, break, dull, mark, ruin) |
| impair(verb, break, dull, hurt, ruin) |