go bad

(verb) stop operating or functioning. Synonyms: fail, go bad, give way, die, give out, conk out, go, break, break down. Examples: "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."

(verb) become unfit for consumption or use. Synonyms: spoil, go bad. Example: "The meat must be eaten before it spoils."