2re·lapse 
/rɪˈlæps/ verb
re·laps·es; re·lapsed; re·laps·ing /rɪˈlæps/ verb [no obj] 1 a : to become ill again after a period of improvement in health
▪ If you don't continue your treatment, you could relapse.
b of an illness : to return or become worse after leaving or improving for a period of time
▪ Malaria can relapse years after the original infection. 2 : to return to a bad condition, form of behavior, etc.
▪ The country soon relapsed into chaos. ▪ She stayed out of trouble for a long time, but then she relapsed into her old ways. ▪ Many former smokers relapse [=begin smoking again] in times of stress.
▪ If you don't continue your treatment, you could relapse.
b of an illness : to return or become worse after leaving or improving for a period of time
▪ Malaria can relapse years after the original infection.
▪ The country soon relapsed into chaos. ▪ She stayed out of trouble for a long time, but then she relapsed into her old ways. ▪ Many former smokers relapse [=begin smoking again] in times of stress.
