Meaning of the word "go sour" in English

What does "go sour" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

go sour

US /ɡoʊ ˈsaʊər/
UK /ɡoʊ ˈsaʊər/
"go sour" picture

Idiom

1.

to turn out badly; to become unpleasant or unsuccessful

Example:
Their business partnership started well, but then things began to go sour.
Their relationship began to go sour after a series of arguments.
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