relapse
verb [ I ]
uk/rɪˈlæps/ usto get worse after a successful period or after increasing in value:
A leading commodities analyst said it thought economic conditions in the US would relapse in the coming months.
If interest rates are set too high, the country may well relapse into recession.
relapse
noun [ S ]
uk/rɪˈlæps, ˈriːlæps/ usa situation in which something gets worse after a successful period or in which prices go down after increasing in value:
Shares of the UK's leading chemicals manufacturer have suffered another relapse in the past week.