Lingo
[go] south
to experience a sudden and significant decline, deterioration, or devaluation, often unexpectedly or rapidly
The origin of the idiom "go south" is unclear, but it is thought to be related to the idea of traveling south, which was historically associated with moving away from civilization or safety into more dangerous or uncertain territory. Over time, the phrase has come to be used more generally to describe any situation where something is not going well, whether it be a project, a plan, or any other situation where the outcome is uncertain or negative.
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