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Comprehensive
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double cross (informal) a betrayal or swindle accomplished by a course of action contrary to that previously agreed upon with the victim. [1/2 definitions]
treachery a breaking of faith or loyalty; betrayal.
treason the betrayal of one's country by going to war against it or giving information to its enemies.
treasonous consisting of, involving, or relating to a betrayal of one's country. [1/2 definitions]