| abate(verb, drop, fall, fail, diminish) |
| adulterate(verb, decline, weaken, degenerate, deteriorate) |
| alloy(verb, decline, weaken, degenerate, deteriorate) |
| atomize(verb, break, collapse, split, undo) |
| backslide(verb, drop, reduce, fall, fail) |
| be worse for wear(verb, decline, fail, lower, weaken) |
| become less(verb, expression, drop, fall, fail) |
| become rotten |
| become worse(verb, expression, decline, fail, lower) |
| break(verb, decline, fail, lower, collapse) |
| break apart(verb, expression, phrasal verb, break, collapse) |
| break down(verb, expression, phrasal verb, break, decline) |
| break up(verb, expression, phrasal verb, break, collapse) |
| cheapen(verb, drop, fall, fail, diminish) |
| come apart(verb, expression, phrasal verb, break, collapse) |
| corrode(verb, decline, reduce, weaken, degenerate) |
| corrupt(verb, decline, reduce, fail, lower) |
| debase(verb, decline, fail, lower, weaken) |
| debilitate(verb, decline, weaken, degenerate, deteriorate) |
| decrease(verb, drop, reduce, fall, fail) |