whistle-blower
noun [ C ] uk/ˈwɪs.əlˌbləʊ.ər/ us/ˈwɪs.əlˌbloʊ.ɚ/
（尤指政府部门或公司里的）告发者，揭发者
a person who tells someone in authority about something illegal that is happening, especially in a government department or a company
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