retrogress
intransitive-verb
UK: /ˌretrəˈɡres/
US: /ˌretroʊˈɡres/
To go back to an earlier and worse condition or state.
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If the treatment stops, the disease may retrogress quickly.
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Without proper investment, the city's infrastructure will retrogress and decay over time.
To return to a previous, less developed state; to decline or deteriorate.
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The project will retrogress if we don't provide resources.
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Some believe society will retrogress to a more primitive condition without education.