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Verb: go bad
  1. Stop operating or functioning
    "The engine went bad on the way to town";
    - fail, give way, die, give out, conk out [informal], go, break, break down, pack up [Brit, informal]
  2. Become unfit for consumption or use
    "the meat must be eaten before it goes bad";
    - spoil

Derived forms: going bad, gone bad, goes bad, went bad

Type of: change, decay