go bad

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go bad (third-person singular simple present goes bad, present participle going bad, simple past went bad, past participle gone bad)

  1. Of foods and commodities, to spoil, rot, or otherwise become unusable due to age or storage conditions.
  2. Of a person or entity, to cease to be reputable and instead become delinquent, criminal, or poorly behaved.
  3. Of a geographic area, to become unsafe.