Definition of poison verb from the Oxford Advanced American Dictionary

     

    poison

     verb
    verb
    NAmE//ˈpɔɪzn//
     
    Verb Forms present simple I / you / we / they poison
     
    he / she / it poisons
     
    past simple poisoned
     
    -ing form poisoning
     
     
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  1. 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.
  2. 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. 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.
See the Oxford Advanced Learner's Dictionary entry: poison