| lapse(verb, decline, fall, fail, degenerate) |
| regress(verb, fall, fail, weaken, degenerate) |
| relapse(verb, decline, fall, weaken, lapse) |
| retrogress(verb, fall, fail, degenerate, deteriorate) |
| fall back(verb, expression, phrasal verb, fall, fail) |
| backslide(verb, decline, fall, weaken, lapse) |
| return(verb, decline, fall, terminate, lapse) |
| recede(verb, decline, fall, terminate, degenerate) |
| retrograde(verb, decline, fall, terminate, degenerate) |
| revert(verb, decline, fall, weaken, lapse) |
| elapse(verb, decline, fall, terminate, degenerate) |
| pass(verb, decline, fall, terminate, degenerate) |
| retrovert |
| slide back(verb, expression, phrasal verb, fall, fail) |
| slip back(verb, expression, fall, fail, weaken) |
| dawdle |
| fall(verb, decline, fail, weaken, lapse) |
| fall behind(verb, expression, phrasal verb) |
| fall from grace(expression, idiom) |
| lag |