Meaning of “whistle-blower” in the English Dictionary

"whistle-blower" in British English

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whistle-blowernoun [ C ]

uk /ˈwɪs.əlˌbləʊ.ər/ us /ˈwɪs.əlˌbloʊ.ɚ/

a person who tells someone in authority about something illegal that is happening, especially in a government department or a company

(Definition of “whistle-blower” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"whistle-blower" in American English

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whistle-blowernoun [ C ]

us /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” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"whistle-blower" in Business English

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whistle-blowernoun [ C ]

also whistleblower uk us WORKPLACE

a person who works for a company or organization that tells an authority about something illegal happening within the company or organization:

Within many organisations a whistleblower is contemptuously regarded as a 'grass' or 'sneak'.
whistle-blowing
noun [ U ]

Local authorities should have clear procedures to encourage staff whistleblowing.

(Definition of “whistle-blower” from the Cambridge Business English Dictionary © Cambridge University Press)