Wiktionary
vb. (en-simple past of: go bad)
Usage examples of "went bad".
He had kept the Onlies, all there were, safe from animals, hunger, cold, and big Onlies who went bad.
Well, if she couldn't get in, she must monitor all those coming and going from the club, and hope the courier would arrive with her credentials so she could go inside before things went bad.
If the yeast in a household or brewery went bad, all that could be done was to buy some from a place still making good beer.
She'd managed to get the message across properly and, not incidentally, to have it both on a security recording and on her own backup just in case things went bad and Cordish decided to shift the blame.
He went bad after being exposed to unsuspected opportunities for making money in Canada, especially around the mining country.
Would he be raging against the fates, the way he always did when things went bad?
And we could get back onto the ground in a hurry if the weather went bad on us again.
Fact he didn't tell you he was wounded makes me think a dope deal went bad, something on that order.