Definition of relapses:
(v) :
(intransitive, informal, specifically) To return to a vice, especially self-harm or alcoholism, failing to maintain abstinence.
(v) :
(intransitive, medicine, of a disease) To recur; to worsen, be aggravated (after a period of improvement).
(n) :
(medicine) An occasion when a person becomes ill again after a period of improvement
(v) :
(intransitive) To fall back again; to slide or turn back into a former state or practice.
(n) :
The act or situation of relapsing.
(v) :
To slip or slide back physically; to turn back.