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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
    
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: betrayed, betraying, betrays

See also: betrayal, betrayer

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

Encyclopedia: Betray