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English definition of “treachery”

treachery

noun [U] uk   /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.
(Definition of treachery from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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