Definitions from Wiktionary ( )

▸ verb:  (transitive) To make something dangerous or toxic by introducing impurities or foreign matter.
▸ verb:  (transitive) To soil, stain, corrupt, or infect by contact or association.
▸ verb:  (transitive) To make unfit for use by the introduction of unwholesome or undesirable elements.
▸ verb:  (transitive) To infect, usually of a deadly virus.

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