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English definition of “treachery”

treachery

noun [U]     /ˈtretʃ.ər.i/ US  /-ɚ-/ formal
behaviour that deceives or is not loyal to someone who trusts you: Corley said she was standing down as leader because of the treachery of her own colleagues.Disloyalty, betrayal and treason
(Definition of treachery noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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