treachery C2 Topic:Places & Geography US /ˈtɹɛt͡ʃəɹi/ See IPA manual Freq #13144 Meanings 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 noun Disloyalty to one's country; treason. The general was executed for treachery against the crown. Thesaurus Synonyms 1 noun · the act of betraying... betrayalperfidydouble-dealingstab in the back 2 noun · disloyalty to one's... treasonperfidy Word family Forms treacheries Derived forms treachertreacherous Related forms tricktrickerytrickstertricky Etymology AI details From Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (“to cheat”). trecherie Middle English tricherie Old French View etymology graph -> Topics Places & Geography Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # treachery **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /ˈtɹɛt͡ʃəɹi/ **Frequency rank:** 13144 ## Meanings 1. The act of betraying someone who trusts you. 2. Disloyalty to one's country; treason. ## Examples - His treachery was revealed when the documents proved he had been spying for the rival firm. - The general was executed for treachery against the crown. ## Derived Forms - treacher - treacherous ## Related Forms - trick - trickery - trickster - tricky ## Roots and Affixes - Root: trecherie - Root: tricherie ## Etymology From Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (“to cheat”). ## AI Etymology Treachery is from Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (“to cheat”). Important recorded forms include trecherie (Middle English) and tricherie (Old French). Current senses include the act of betraying someone who trusts you and disloyalty to one's country; treason. The wider family includes derived forms such as treacher and treacherous; related words such as trick, trickery, trickster, and tricky. ## Topics - Places & Geography - Word Formation & Derivatives markdown