adulterate
verb (used with object)
to debase or make impure by adding inferior materials or elements; use cheaper, inferior, or less desirable goods in the production of (any professedly genuine article).
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Anon he takes the form of an adulterator of provisions, of various drinkables, of cloth, silk, linen, &c.
From Ancient Faiths And Modern A Dissertation upon Worships, Legends and Divinities by Thomas Inman