gone bad

adjective4

1. •
   Of foods and commodities, having become spoiled, rotten, or otherwise unusable due to age or storage conditions.
2. •
   Of a delinquent or criminal act, having unexpectedly become more violent than is typical for that act—having resulted in an attack on a victim leading to serious injury or death.

   • a drug deal gone bad, a robbery gone bad
3. •
   Of a person or entity, having ceased to be reputable and having instead become delinquent, criminal, or poorly behaved.
4. •
   Of a region or area, having become unsafe.