| lose luster(expression, dull, disappear, dissolve) |
| moderate(verb, decline, fall, fail, diminish) |
| muddy(dull, dissolve, blotched, fuddled) |
| neutralize(dull, disappear, dissolve, vanish) |
| pale(dull, dissolve, blotched, fuddled) |
| peter out(verb, expression, phrasal verb, decline, fall) |
| poop out(verb, expression, decline, fall, fail) |
| quiet(verb, decline, fall, fail, diminish) |
| rarefy(verb, decline, fall, fail, diminish) |
| shrivel(verb, decline, fall, fail, diminish) |
| slack off(verb, expression, decline, fall, fail) |
| taper(verb, decline, fall, fail, diminish) |
| tarnish(dull, dissolve, blotched, fuddled) |
| thin(verb, decline, fall, fail, diminish) |
| tire(verb, decline, fall, fail, diminish) |
| tone down(expression, dull, disappear, dissolve) |
| tucker out(verb, expression, decline, fall, fail) |
| wash out(expression, dull, disappear, dissolve) |
| waste away(verb, expression, decline, fall, fail) |
| weaken(verb, clear, decline, fall, fail) |