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English definition of “whistle-blower”

whistle-blower

noun [C]    /ˈhwɪs·əlˌbloʊ·ər, ˈwɪs-/
a person who tells someone in authority about something illegal that is happening, esp. in a business or government
(Definition of whistle-blower noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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