2 definitions found From WordNet (r) 2.0 [wn]: blackmailer noun: a criminal who extorts money from someone by threatening to expose embarrassing information about them [syn: {extortioner}, {extortionist}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Blackmailer \Black"mail'er\, noun One who extorts, or endeavors to extort, money, by black mailing.

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