turn sour

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Related to turned sour: go sour, Hallucinatory state

turn sour

To become unpleasant or troubling. Those two are bickering all the time now—I hope their relationship hasn't turned sour. Don’t bring up politics unless you want things to turn sour real fast!
See also: sour, turn

go/turn ˈsour

become less enjoyable, pleasant or good: Relations between the two nations have recently gone sour.
See also: go, sour, turn
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