relapse
1. [ verb ] go back to bad behavior
Synonyms: lapse retrogress regress fall_back recidivate
Examples:

"Those who recidivate are often minor criminals"

Related terms: revert backsliding recidivism
2. [ verb ] deteriorate in health
Synonyms: get_worse
Examples:

"he relapsed"

Related terms: get_well change_state backsliding
3. [ noun ] a failure to maintain a higher state
Synonyms: lapse recidivism lapsing relapsing reversion reverting backsliding
Related terms: failure recidivism revert get_worse lapse
Similar spelling:   relapsing