Getting worse or declining.
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Becoming progressively worse or deteriorating over time.
Something going downhill is declining in quality, condition, or performance — the slide feels inevitable and increasingly hard to reverse the longer it continues.
"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