Cách sử dụng
The expression "go/turn sour" means that something that was once good or positive has become bad or negative. It is often used to describe food or drinks that have gone bad and are no longer safe to consume. However, it can also be used to describe relationships, situations, or experiences that have become unpleasant or negative. For example, if a friend who used to be kind and supportive suddenly starts acting rude and distant, you might say that your friendship has turned sour. Overall, it is a useful expression to describe a negative change in a situation.