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Verb: betray  bi'trey
  1. Reveal unintentionally
    "Her smile betrayed her true feelings";
    - bewray [archaic]
  2. Deliver to an enemy by treachery
    "The spy betrayed his country";
    - sell
  3. Disappoint, prove undependable to; abandon, forsake
    "His sense of smell betrayed him this time";
    - fail
  4. Be sexually unfaithful to one's partner in marriage
    "She betrays her husband";
    - cheat on, cheat, cuckold, wander
  5. Give away information about somebody
    "He betrayed his classmate who had cheated on the exam";
    - denounce, tell on, give away, rat [informal], grass, shop [informal], snitch [informal], stag, squeak [informal]
  6. Cause someone to believe an untruth
    "The insurance company betrayed me when they told me they were covering my house";
    - deceive, lead astray

Derived forms: betraying, betrayed, betrays

Type of: break, bring out, cozen [literary], deceive, delude, disappoint, disclose, discover, disinform, divulge, expose, give away, inform, lay bare, lead on, let down, let on, let out, misinform, mislead, reveal, uncover, unwrap

Antonym: undeceive

Encyclopedia: Betray