Answer: relapsed

AnswerCrossword Clue
RELAPSED

Went off the wagon, e.g.

RELAPSED

Got sick again

RELAPSED

Became ill again

RELAPSED
Backslid
RELAPSED
Took 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