The act or situation of relapsing.
"After months of sobriety, his recent drug use marked a painful relapse that shocked everyone at the meeting."
go back to bad behavior
"Those who recidivate are often minor criminals"
To fall back again; to slide or turn back into a former state or practice.
"After months of careful dieting, he feared that eating that entire cake would cause him to relapse into his old habits of overindulgence."