Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “poison”


verb [T] (ADD SUBSTANCE)    /ˈpɔɪ.zən/
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.Poisoning and allergyKillingMurder and attempted murderMurder and attempted murderKilling B2 to put poison in someone's food or drink: He said that someone had poisoned his coffee.Poisoning and allergy B2 to add dangerous chemicals or other harmful substances to something such as water or air: The chemical leak had poisoned the water supply.Environmental issuesRubbish and wasteProtection and protectors
(Definition of poison verb (ADD SUBSTANCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of poison

Definitions of “poison” in other dictionaries

Word of the Day


showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More