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Degradate (verb)
To cause, or to undergo degradation
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Degrade (verb)
To lower in value or social position.
“Fred degrades himself by his behaviour.”
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Degrade (verb)
To reduce in quality or purity.
“The DNA sample has degraded.”
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Degrade (verb)
To reduce in altitude or magnitude, as hills and mountains; to wear down.
Wiktionary