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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, grass, shop, snitch, stag, squeak
     
  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, betrays, betrayed

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

Encyclopedia: Betray