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Wiktionary
go bad

vb. 1 Of foods and commodities, to spoil, rot, or otherwise become unusable due to age or storage conditions. 2 Of a person or entity, to cease to be reputable and instead become delinquent, criminal, or poorly behaved. 3 Of a geographic area, to become unsafe.

WordNet
go bad
  1. v. 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]

Usage examples of "go bad".

It might interest you to know that a close relative of the bacterium that makes canned soup go bad is responsible for gas gangrene.

I saw Plunder Road and The Killing and learned that perfectly planned heists go bad because daring heist men are selfdestructive losers playing out their parts in a preordained endgame with authority.

Although Gibreel and his cohorts cannot predict things with any certainty, they understand the world well enough to have a good idea when things are starting to 'go bad'.

The older students wanted to know what had caused Holly Burden to go bad, caused her to hate them.

And so, after months, even years, of painstaking planning and preparation, they often had operations go bad because one of their officers had decided that life in the land of the enemy wasn't quite so bad as it was portrayed.

Every so often he'd see something going out to Officer 457 in Rome, for example, and wonder if his country really wanted to risk the consequences of having the mission order go bad.