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English definition of “cover-up”

cover-up

noun [C] uk   /ˈkʌv.ər.ʌp/ us    /-ɚ.ʌp/
an attempt to prevent the public from discovering information about a serious crime or mistake: Allegations of a cover-up of the effects of pollution have been strongly denied.Secrecy and privacy
(Definition of cover-up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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