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treachery

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treachery/ˈtrɛtʃəri/noun
pluraltreacheries
treachery
/ˈtrɛtʃəri/
noun
pluraltreacheries
Learner's definition of TREACHERY  
[noncount]  : harmful things that are done usually secretly to a friend, your own country, etc.
[count]  : an act of harming someone who trusts you
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