relapse

To fall back again; to slide or turn back into a former state or practice.intransitive

• He has improved recently but keeps relapsing into states of utter confusion.
• to relapse into a stupor, into vice, or into barbarism

To recur; to worsen, be aggravated (after a period of improvement).intransitive

To return to a vice, especially self-harm or alcoholism, failing to maintain abstinence.informalintransitivespecifically

• relapsed after 5 months of being clean

To slip or slide back physically; to turn back.

• You slip your hold and change your side, Relapsing from a necessary guide.

The act or situation of relapsing.

• a drug relapse

An occasion when a person becomes ill again after a period of improvement

One who has relapsed, or fallen back into error; a backslider.obsolete