| enfeeble(harm, hinder, spoil, weaken, blunt) |
| enlarge(verb, worsen, intensify, heighten) |
| evaporate(verb, drop, cut, decline, reduce) |
| exasperate(verb, decline, degenerate, worsen, rub) |
| fall apart(verb, expression, decline, weaken, degenerate) |
| fall back(verb, expression, decline, decrease, lessen) |
| fall flat(verb, expression, decline, fall, fail) |
| fall short(verb, expression, decline, fall, fail) |
| fall through(verb, expression, decline, fall, fail) |
| fester(verb, decay, rot, decompose, molder) |
| fizzle out(verb, expression, stop, break, end) |
| flounder(verb, decline, fall, fail, slip) |
| fold(verb, decline, fall, fail, diminish) |
| foul |
| founder(verb, decline, fall, fail, slip) |
| go astray(verb, expression, decline, fall, fail) |
| go down swinging(expression, idiom, decline, fall, fail) |
| go off(verb, expression, decay, taint, disintegrate) |
| go to pieces(verb, expression, idiom, break, beat) |
| go up in smoke(expression, idiom, decline, fall, fail) |