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poison

verb [T] (SPOIL)
 
 
/ˈpɔɪ.zən/

Definition

to spoil a friendship or another situation, by making it very unpleasant: The long dispute has poisoned relations between the two countries.Damaging and spoilingDestroying and demolishing
(Definition of poison verb (SPOIL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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