Getting worse or declining.
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Getting worse and worse as time passes.
When something is going downhill, its quality or condition keeps dropping.
The longer it goes on, the harder it is to turn around.
"Going South"
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Going wrong or failing — going downhill implies a gradual decline; going south can be more sudden
"On the Decline"
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More formal — going downhill feels more colloquial and suggests a visible, observable slide
"Going Downhill"
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Gradually worsening or deteriorating in quality, condition, or performance