'go bad' definitions:

verb

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]

verb

Become unfit for consumption or use; "the meat must be eaten before it spoils" [syn: spoil, go bad]