go bad

go bad (http://definr.com/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, {give
          way}, die, give out, conk out, go, break, {break
     2:  become unfit for consumption or use; "the meat must be
        eaten before it spoils" [syn: spoil]