Definition of "treacher" [treach•er]

• A traitor or deceiver. (noun)

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• "And if a teacher is truly just a lousy treacher -- and let ` s face it, there are lousy -- lousy TV show hosts, as I ` m saying right now."
• ""I have not yet replaced my current Knight, treacher though he is," she purred."
• "And remove your treacher - ous carcass from my garden."