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go bad

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go bad

to become rotten, undesirable, evil, etc. I'm afraid that this milk has gone bad. Life used to be wonderful. Now it has gone bad.

See also: bad

go bad

Spoil, decay; also, turn to crime. For example, You can tell from the smell that this milk has gone bad, or If he keeps running around with that street gang, he's sure to go bad. [Late 1800s]

See also: bad