What is the meaning of go bad?

verb

• Stop operating or functioning.
  • usage: "The engine finally went"; "The car died on the road"; "The bus we travelled in broke down on the way to town"; "The coffee maker broke"; "The engine failed on the way to town"; "her eyesight went after the accident"
  • synonyms: fail, give way, die, give out, conk out, go, break, break down
• Become unfit for consumption or use.
  • usage: "the meat must be eaten before it spoils"
  • synonyms: spoil