| defile(verb, decline, hurt, ruin, harm) |
| degenerate(verb, break, beat, decline, crush) |
| fade(verb, decline, weaken, lessen, degenerate) |
| mildew(verb, decline, weaken, lessen, degenerate) |
| addle(verb, decay, taint, decompose) |
| break up(verb, expression, break, beat, decline) |
| collapse(verb, break, beat, decline, crush) |
| corrode(verb, decline, weaken, lessen, degenerate) |
| dissolve(verb, beat, decline, crush, weaken) |
| pollute(verb, decline, hurt, harm, spoil) |
| sink(verb, break, decline, collapse, split) |
| slump(verb, decline, weaken, lessen, degenerate) |
| wane(verb, decline, weaken, lessen, degenerate) |
| be impaired(decline, weaken, lessen, degenerate, deteriorate) |
| become contaminated(expression, decline, weaken, lessen, degenerate) |
| blight(verb, decline, hurt, ruin, damage) |
| depreciate(decline, ruin, harm, weaken, lessen) |
| discolor(verb, decline, hurt, harm, spoil) |
| dry-rot(decline, weaken, lessen, degenerate, deteriorate) |
| dwindle(decline, weaken, lessen, degenerate, deteriorate) |