treachery

Meanings

1. 1
   noun

   The act of betraying someone who trusts you.

   His treachery was revealed when the documents proved he had been spying for the rival firm.

2. 2
   noun

   Disloyalty to one's country; treason.

   The general was executed for treachery against the crown.

From Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (“to cheat”).

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