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English definition of “blackmail”

blackmail

noun [U]  /ˈblækˌmeɪl/ us  
the act of threatening to harm someone or someone's reputation unless the person does as you say, or a payment made to someone who has threatened to harm you or your reputation if you fail to pay the person: Reckless behavior made him an easy target for blackmail.
blackmail
verb [T]  /ˈblækˌmeɪl/ us  
The guy who blackmailed my father went to jail.
(Definition of blackmail from the Cambridge Academic Content Dictionary © Cambridge University Press)
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