treach·​ery | \ ˈtre-chə-rē, ˈtrech-rē\
plural treacheries

Definition of treachery

1 : violation of allegiance or of faith and confidence : treason
2 : an act of perfidy or treason

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Examples of treachery in a Sentence

a tale of treachery and revenge was furious that she revealed his secret and never forgave her for the treachery

Recent Examples on the Web

If that's exposing Tyler or some other bit of Klingon treachery—who knows. Darren Orf, Popular Mechanics, "Last Night's 'Star Trek Discovery' Was a Maze of Confusion," 6 Nov. 2017 Problems arise when criminals bring their beefs and business onto the premises, leading to treachery and mischief and much violence. Gary Thompson,, "Jodie Foster talks about 'Hotel Artemis,' 'Black Mirror,' the business that shaped her, and the business she's helping to shape," 1 June 2018 Hovhannisyan, as a pure-hearted, tragic Siegfried, was the focus of Odile’s treachery and, in the end, the force that triumphed over evil. Elaine Schmidt, Milwaukee Journal Sentinel, "Milwaukee Ballet's 'Swan Lake' is one gorgeous dance after another," 1 June 2018 Arnold’s treachery is usually put down to his stubborn pride and rivalries with fellow officers. William Anthony Hay, WSJ, "‘The Tragedy of Benedict Arnold’ and ‘Turncoat’ Review: His Own Worst Enemy," 24 May 2018 For protesters in Greece, any sharing of the M-word is treachery. The Economist, "Meet a new country: “Northern Macedonia”," 14 June 2018 In movies about hustlers and confidence games, there is usually the scent of underlying treachery, the possibility of dishonor among thieves. Gary Thompson,, "'Ocean's 8': Sandra Bullock-led reboot with stiletto heels," 6 June 2018 At its very center stands Satan himself, guilty of treachery against God. William Anthony Hay, WSJ, "‘The Tragedy of Benedict Arnold’ and ‘Turncoat’ Review: His Own Worst Enemy," 24 May 2018 Trump's recent tweets reflect much of the xenophobia and paranoia over both foreign threats and domestic treachery that underlay his campaign, and which still galvanize his hard-line support. Ishaan Tharoor, Washington Post, "Trump’s quixotic quest to bash immigration," 4 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'treachery.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of treachery

13th century, in the meaning defined at sense 1

History and Etymology for treachery

Middle English trecherie, from Anglo-French, from trecher, tricher to deceive, from Vulgar Latin *triccare — more at trick entry 1

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Time Traveler for treachery

The first known use of treachery was in the 13th century

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English Language Learners Definition of treachery

: harmful things that are done usually secretly to a friend, your own country, etc.

: an act of harming someone who trusts you


treach·​ery | \ ˈtre-chə-rē \
plural treacheries

Kids Definition of treachery

1 : the behavior of a person who betrays trust or faith a tale of treachery and revenge
2 : an act or instance of betraying trust or faith She was hurt by her friend's treacheries.

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Comments on treachery

What made you want to look up treachery? Please tell us where you read or heard it (including the quote, if possible).


to gather or build up little by little

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