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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")
What is the origin of the idiom "go sour" and when to use it?
The idiom "go sour" is thought to have started in the early 1500s from the way people saw milk turn sour, which happens naturally because of bacteria. Milk that is sour is not good anymore and it tastes bad, so people started using this idea to describe other things that were not good or that got worse. Over time, the phrase became common in informal contexts and is now used to mean that something has changed for the worse.
02
(of food or drinks) to become unpleasant in taste or smell
例
The once-promising project started to go sour as deadlines were repeatedly missed.
The business deal began to go sour when unexpected challenges arose.
If the mayonnaise smells odd, it might have gone sour.
The milk tastes off, so I think it's gone sour.
Unfortunately, their friendship started to go sour after a series of misunderstandings.
