| relapse(verb, weaken, degenerate, deteriorate, revert) |
| backslide(degenerate, deteriorate, revert) |
| fall(fail, weaken, degenerate, deteriorate, revert) |
| fall back(expression, fall, fail, degenerate, deteriorate) |
| lapse(fall, fail, degenerate, deteriorate, revert) |
| recidivate(fall, fail, weaken, degenerate, deteriorate) |
| regress(fall, fail, weaken, degenerate, deteriorate) |
| revert(degenerate, deteriorate, reoffend) |
| slip back(expression, fall, fail, weaken, degenerate) |
| be overcome(fall, fail, weaken, degenerate, deteriorate) |
| be overtaken(fall, fail, weaken, degenerate, deteriorate) |
| fade(fall, fail, weaken, degenerate, deteriorate) |
| fail(fall, weaken, degenerate, deteriorate, revert) |
| fall again into(expression, idiom) |
| fall from grace(expression, idiom) |
| have a relapse(expression, idiom) |
| lapse back |
| recur to |
| retrogress(fall, fail, degenerate, deteriorate, revert) |
| return to |