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[ US /bɪˈtɹeɪ/ ]
[ UK /bɪtɹˈe‍ɪ/ ]
VERB
  1. deliver to an enemy by treachery
    Judas sold Jesus
    The spy betrayed his country
  2. cause someone to believe an untruth
    The insurance company deceived me when they told me they were covering my house
  3. disappoint, prove undependable to; abandon, forsake
    His sense of smell failed him this time
    His children failed him in the crisis
    His strength finally failed him
  4. reveal unintentionally
    Her smile betrayed her true feelings
  5. give away information about somebody
    He told on his classmate who had cheated on the exam
  6. be sexually unfaithful to one's partner in marriage
    She cheats on her husband
    Might her husband be wandering?

How To Use betray In A Sentence

  • Like a lot of boys born in Ireland circa 1979 and 1980, my brother too bears a name that betrays his vintage.
  • The feeling of betrayal goes far deeper. Times, Sunday Times
  • But emotional ferment still seething from his betrayed boyhood keeps his body churning with unruly symptoms. Times, Sunday Times
  • She managed to speak without betraying her nervousness.
  • They went into hiding in Katlijk, but where betrayed and fusilladed by the German oppressor.
  • Theirs is a consummately selfish act, no less than a low-life betrayal of civilization.
  • And, finally, pratfalls are a universal language, and Moliere never betrayed his debt to the Italian tradition of commedia dell'arte.
  • And then the flesh, as it is the greatest retardment in good, it is the greatest incitement to evil, it is a bosom enemy, that betrays us to Satan, it is near us and connatural to us. The Works of the Rev. Hugh Binning
  • If cryonic preservation does indeed signal betrayal, it does so while asking much from those who would be betrayed. Times, Sunday Times
  • Our legal system is fundamentally an adversary system - and this solution would betray its very nature.
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