go bad

/G OW1 B AE1 D/
verb
  1. 1

    (of foods and commodities) To spoil, rot, or otherwise become unusable due to age or storage conditions.

  2. 2

    (of a person or entity) to cease to be reputable and instead become delinquent, criminal, immoral, corrupt or poorly behaved.

  3. 3

    (of a geographic area) To become unsafe.