- 1poison somebody/yourself (with something) to harm or kill a person or an animal by giving them poison In the last chapter, she poisons herself with arsenic. Thousands are at risk of being poisoned by fumes from faulty heaters.
- 2poison something to put poison in or on something a poisoned arrow Someone had been poisoning his food. Large sections of the river have been poisoned by toxic waste from factories. Exhaust fumes are poisoning our cities.
- 3 poison something to have a bad effect on something His comment served only to poison the atmosphere still further. She succeeded in poisoning their minds against me.
NAmE//ˈpɔɪzn//Verb Forms present simple I / you / we / they poison
he / she / it poisons
past simple poisoned
-ing form poisoning