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
例子
The collaboration between the two teams began to go sour due to conflicting interests.
02
(of food or drinks) to become unpleasant in taste or smell
Collocation
例子
I left the milk out overnight, and it started to go sour.
