Definitions from Wiktionary ( )

▸ noun:  A substance that is harmful or lethal to a living organism when ingested.
▸ noun:  (figuratively) Anything harmful to a person or thing.
▸ noun:  (informal, idiomatic) An alcoholic drink. (Mainly in the phrases "name your poison" and "what's your poison?")
▸ noun:  (chemistry) Any substance that inhibits catalytic activity.
▸ verb:  (transitive) To use poison to kill or paralyse (somebody).
▸ verb:  (transitive) To pollute; to cause to become poisonous.
▸ verb:  (transitive) To cause to become much worse.
▸ verb:  (transitive) To cause (someone) to hate or to have unfair negative opinions.
▸ verb:  (chemistry) To inhibit the catalytic activity of.
▸ verb:  (transitive, computing) To place false or malicious data into (a cache, etc.) as part of an exploit.

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