| tamper with(verb, expression, phrasal verb, harm, spoil) |
| weaken(verb, break, cut, decline, hurt) |
| be impaired(verb, decline, weaken, lessen, degenerate) |
| become contaminated(expression, decline, weaken, lessen, degenerate) |
| blend(noun, cut, thin, spoil, corrupt) |
| blighted |
| blotch(noun, verb, dirty, foul, stain) |
| blur(verb, hurt, harm, spoil, dirty) |
| break up(expression, decline, weaken, lessen, degenerate) |
| cheapen(cut, thin, spoil, corrupt, degrade) |
| collapse(verb, decline, weaken, lessen, degenerate) |
| congest |
| corrode(verb, break, dull, decline, hurt) |
| crumble(verb, decline, hurt, harm, spoil) |
| curdle(verb, decline, weaken, lessen, degenerate) |
| curse(criticize, debase, taint, slander, defile) |
| daub(noun, uncleanness) |
| decline(verb, weaken, lessen, degenerate, deteriorate) |
| decompose(verb, decline, hurt, harm, spoil) |
| depreciate(verb, cut, decline, ruin, criticize) |