Definition of poison verb from the Oxford Advanced Learner's Dictionary

      

    poison

     verb
    verb
    BrE BrE//ˈpɔɪzn//
     
    ; NAmE NAmE//ˈpɔɪzn//
     
    Verb Forms present simple I / you / we / they poison
    BrE BrE//ˈpɔɪzn//
     
    ; NAmE NAmE//ˈpɔɪzn//
     
    he / she / it poisons
    BrE BrE//ˈpɔɪznz//
     
    ; NAmE NAmE//ˈpɔɪznz//
     
    past simple poisoned
    BrE BrE//ˈpɔɪznd//
     
    ; NAmE NAmE//ˈpɔɪznd//
     
    past participle poisoned
    BrE BrE//ˈpɔɪznd//
     
    ; NAmE NAmE//ˈpɔɪznd//
     
    -ing form poisoning
    BrE BrE//ˈpɔɪznɪŋ//
     
    ; NAmE NAmE//ˈpɔɪznɪŋ//
     
     
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  1. 1  poison 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. 2  poison 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. 3poison 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.
  4. Word Origin Middle English (denoting a harmful medicinal draught): from Old French poison ‘magic potion’, from Latin potio(n-) ‘potion’, related to potare ‘to drink’.Extra examples He was convicted of trying to poison her. He was accused of poisoning his wife. I hope that if we do have disagreements they won’t poison our relationship. Poisoning the rats is expensive and harmful to the environment.Idioms (especially British English) a thing that seems attractive when it is given to somebody but which soon becomes unpleasant He inherited a poisoned chalice when he took over the job as union leader.
See the Oxford Advanced American Dictionary entry: poison