go/turn sour

go sour

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

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
Farlex Dictionary of Idioms.

go sour

Fig. to turn bad or unpleasant. It looks like all my plans are going sour. My whole life is going sour right now.
See also: go, sour
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

go/turn ˈsour

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

go sour

in. to turn bad or unpleasant. My whole life is going sour right now.
See also: go, sour
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • go sour
  • turn sour
  • come to a bad end
  • come to a bad/sticky end
  • dance card is full, my
  • go to the devil/hell
  • not know whether you're coming or going
  • what part of no don't you understand?
  • don't change/swap horses in midstream
  • give (someone) what for, to