
Go/turn sour
Negative Outcome
Use when expressing that something hoped for didn't work out.

The peace talks between the countries went sour and war ensued.
Business Failures
Common in business and negotiations that don't end well.

The merger went sour once the financial discrepancies were discovered.
Subtle Warning
May imply a gradual process, not always immediate.

You can sense things might go sour when communication breaks down.
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