Answer: RELAPSED

AnswerCrossword Clue
RELAPSEDWent off the wagon, e.g.
RELAPSEDGot sick again
RELAPSEDBecame ill again
RELAPSEDBackslid
RELAPSEDTook a turn for the worse
RELAPSEDSank.
RELAPSEDTook a turn for the worse.
RELAPSEDSlipped back
RELAPSEDSlipped back to evil ways
RELAPSEDSlipped back to a former state
RELAPSEDFell back
RELAPSEDHad a setback
relapsedReturn to (a less active or a worse state)
relapsed(of someone suffering from a disease) Suffer deterioration after a period of improvement
relapsedRELAPSE, to slip back into a former state