Definition of poisons:
(n) :
A substance that is harmful or lethal to a living organism when ingested.
(n) :
(figuratively) Anything harmful to a person or thing.
(n) :
(informal, idiomatic) An alcoholic drink. (Mainly in the phrases "name your poison" and "what's your poison?")
(v) :
(transitive) To use poison to kill or paralyse (somebody).
(v) :
(transitive) To pollute; to cause to become poisonous.
(v) :
(transitive) To cause to become much worse.