| reduction |
| relapse(verb, decline, fail, fade, deteriorate) |
| relax(verb, decline, fail, fade, deteriorate) |
| sap(verb, decline, fail, fade, deteriorate) |
| soften(verb, decline, fail, fade, deteriorate) |
| subside(verb, decline, fail, weaken, fade) |
| temper(verb, decline, fail, fade, deteriorate) |
| thin(verb, decline, fail, fade, deteriorate) |
| thin out(verb, expression, decline, fail, fade) |
| tire(verb, decline, fail, fade, deteriorate) |
| totter(verb, decline, fail, fade, deteriorate) |
| tremble(verb, decline, fail, fade, deteriorate) |
| undermine(verb, decline, fail, fade, deteriorate) |
| vitiate(verb, decline, fail, fade, deteriorate) |
| wane(verb, decline, fail, weaken, fade) |
| water down(verb, expression, decline, fail, fade) |
| weaken(verb, decline, fail, fade, deteriorate) |
| wear off(verb, expression, decline, fail, weaken) |
| wilt(verb, decline, fail, fade, deteriorate) |
| withers |