poison [ˈpoɪzn̩]

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¹ poison noun

• a substance that can cause people or animals to die or to become very sick if it gets into their bodies especially by being swallowed
• something (such as an idea, emotion, or situation) that is very harmful or unpleasant

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² poison verb

• to cause (a person or animal) to die or to become very sick with poison
• to put a harmful or deadly substance in or on (something)
• to change (something) in a very harmful or unpleasant way