From Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (to cheat), from Middle Dutch trek (a trick), from trekken (to draw, play a trick on). More at trick.


  • IPA(key): /ˈtɹɛtʃəɹi/, /ˈtɹɛtʃɹi/
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treachery (countable and uncountable, plural treacheries)

  1. Deliberate, often calculated, disregard for trust or faith.
  2. The act of violating the confidence of another, usually for personal gain.
  3. Treason.
  4. (countable) An act or instance of treachery.
    • 1938, Norman Lindsay, Age of Consent, Sydney: Ure Smith, published 1962, page 78:
      These submerged treacheries left an atmosphere. Even two such practised obliterators of their species as Bradly and Podson could not fail to note that each was secreting a certain reservation of opinion on the other.


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