go bad in WordNet English dictionary

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"
   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"
   spoil  go bad 
   

go bad in English Wiktionary