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
down}]
2: become unfit for consumption or use; "the meat must be
eaten before it spoils" [syn:
spoil]