go bad
    v 1: stop operating or functioning; "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" [syn: fail, go bad, give way, die,
         give out, conk out, go, break, break down]
    2: become unfit for consumption or use; "the meat must be eaten
       before it spoils" [syn: spoil, go bad]