1. Reveal unintentionally (synset 200938362)
    "Her smile betrayed her true feelings"
  2. Deliver to an enemy by treachery (synset 202543073)
    "Judas sold Jesus"; "The spy betrayed his country"
  3. Disappoint, prove undependable to;
    Abandon, forsake (synset 201803246)
    "His sense of smell failed him this time"; "His strength finally failed him"; "His children failed him in the crisis"
  4. Be sexually unfaithful to one's partner in marriage (synset 202582588)
    "She cheats on her husband"; "Might her husband be wandering?"
  5. Give away information about somebody (synset 200843665)
    "He told on his classmate who had cheated on the exam"
  6. Cause someone to believe an untruth (synset 200856102)
    "The insurance company deceived me when they told me they were covering my house"

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