Longman Dictionary of Contemporary English homepage

Date: 1100-1200
Language: Old French
Origin: trecherie, from trechier, trichier; TRICK1

treachery

noun
     
treach‧e‧ry plural treacheries
1 [uncountable] behaviour in which someone is not loyal to a person who trusts them, especially when this behaviour helps that person's enemies:
the treachery of those who plotted against the king
2 [countable usually plural] a disloyal action against someone who trusts you

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