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English definition of “whistle-blower”

whistle-blower

noun [C] uk   /ˈwɪs.l̩ˌbləʊ.ər/ us    /-ˌbloʊ.ɚ/
a person who tells someone in authority about something illegal that is happening, especially in a government department or a companyPeople who reveal secrets and tell tales
(Definition of whistle-blower from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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