relapse

1 relapse /ˈriːˌlæps/ noun
plural relapses
1 relapse
/ˈriːˌlæps/
noun
plural relapses
Britannica Dictionary definition of RELAPSE
1 
: the return of an illness after a period of improvement
[count]
[noncount]
2 
: a return to bad behavior that you had stopped doing
[count]
[noncount]
2 relapse /rɪˈlæps/ verb
relapses; relapsed; relapsing
2 relapse
/rɪˈlæps/
verb
relapses; relapsed; relapsing
Britannica Dictionary definition of RELAPSE
[no object]
1 
a  : to become ill again after a period of improvement in health
b  of an illness : to return or become worse after leaving or improving for a period of time
2 
: to return to a bad condition, form of behavior, etc.