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English definition of “poison”

poison

noun [C or U] uk   /ˈpɔɪ.zən/ us  
B2 a substance that can make people or animals ill or kill them if they eat or drink it: The pest control officer put bowls of rat poison in the attic. Her drink had been laced with a deadly poison.

poison

verb [T] uk   /ˈpɔɪ.zən/ us  

poison verb [T] (ADD SUBSTANCE)

B2 to kill a person or animal or to make them very ill by giving them poison: Four members of the family had been poisoned, but not fatally. B2 to put poison in someone's food or drink: He said that someone had poisoned his coffee. B2 to add dangerous chemicals or other harmful substances to something such as water or air: The chemical leak had poisoned the water supply.

poison verb [T] (SPOIL)

to spoil a friendship or another situation, by making it very unpleasant: The long dispute has poisoned relations between the two countries.
(Definition of poison from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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