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poison

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noun poison pronunciation in American English /ˈpɔɪz(ə)n/ 
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singularpoison
pluralpoisons
  1. 1
    [countable/uncountable] a substance that can kill you or make you sick if you eat, drink, or breathe it

    Some mushrooms contain poison.

    rat poison (=poison used for killing rats)

  2. 2
    [countable/uncountable] something that has a negative effect

    Capitalism is regarded as a poison that is destroying the traditional way of life.

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