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To make (something) less innocent or natural; to artificialize.
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To make (something) more sophisticated (“complex, developed, or refined”); to develop, to refine.
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To make (oneself or someone) more sophisticated (“experienced in the ways of the world, that is, cosmopolitan or worldly-wise”); to cosmopolitanize.
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To alter and make impure (something) by mixing it with some foreign or inferior substance, especially with an intention to deceive; to adulterate; (generally) to corrupt or deceive (someone, their thinking, etc.).
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To change the meaning of (something) in a deceptive or misleading way.
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To apply an artificial technique to (something).
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(intransitive) To practise sophistry (“the (deliberate) making of arguments that seem plausible but are fallacious or misleading”).