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c.1400, "rendered impure or unclean," past participle adjective from pollute (v.). Meaning "drunk" is from 1912, American English slang; ecological sense is from 1888.
pollute pol·lute (pə-lōōt')
v. pol·lut·ed, pol·lut·ing, pol·lutes
To make unfit for or harmful to living things, especially by the addition of waste matter; contaminate.
To make less suitable for an activity, especially by the introduction of unwanted factors.