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English definition of “debunk”

debunk

verb [T] uk   /ˌdiːˈbʌŋk/ informal us  
to show that something is less important, less good, or less true than it has been made to appear: The writer's aim was to debunk the myth that had grown up around the actress.Denying and contradicting
(Definition of debunk from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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