to go sour
01
(of situations, moods, or relationships) to become unpleasant or unsuccessful
![to [go] sour definition and meaning](https://cdn.langeek.co/photo/41295/original/?type=jpeg "to [go] sour definition and meaning")
Idiom
例
Unfortunately, their friendship started to go sour after a series of misunderstandings.
02
(of food or drinks) to become unpleasant in taste or smell
Collocation例
The cream in the recipe went sour, so I had to discard it and start over.
