| ebb(verb, decline, weaken, degenerate, deteriorate) |
| fade(verb, decline, weaken, degenerate, deteriorate) |
| fail(verb, decline, weaken, degenerate, deteriorate) |
| fall apart(verb, expression, decline, degenerate, degrade) |
| flag(verb, decline, weaken, degenerate, deteriorate) |
| get worse(verb, expression, decline, weaken, wane) |
| go downhill(verb, expression, decline, fail, lower) |
| go to pieces(verb, expression, idiom, decline, weaken) |
| go to pot(verb, expression, idiom, decline, fail) |
| go to the dogs(verb, expression, idiom, decline, fail) |
| hit the skids(verb, expression, idiom, decline, fail) |
| impair(verb, decline, weaken, degenerate, deteriorate) |
| injure(verb, decline, weaken, degenerate, deteriorate) |
| languish(verb, decline, weaken, degenerate, deteriorate) |
| lapse(verb, decline, weaken, degenerate, deteriorate) |
| lessen(verb, decline, weaken, degenerate, deteriorate) |
| lose it(verb, expression, phrasal verb, decline, fail) |
| lose quality(verb, expression, decline, fail, lower) |
| lower(verb, decline, weaken, degenerate, deteriorate) |
| mar(verb, decline, weaken, degenerate, deteriorate) |