To make something filthy or dirty; to cause something to become unclean or morally corrupt.
From filth (Old English fylþ) + -ify (from Latin -ficare, to make or cause). This is a constructed verb using the productive suffix -ify, which has been used in English since the 14th century to create verbs from nouns and adjectives.
The -ify suffix is one of English's most creative tools—you can theoretically filthify, beautify, horrify, or terrify almost any noun or adjective! It's how the language stays flexible and lets us express new ideas.
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