betray

Verb

• cause someone to believe an untruth
  • The insurance company deceived me when they told me they were covering my house
    

• give away information about somebody
  • He told on his classmate who had cheated on the exam
    

• be sexually unfaithful to one's partner in marriage
  • She cheats on her husband
    
  • Might her husband be wandering?
    

• disappoint, prove undependable to; abandon, forsake
  • His sense of smell failed him this time
    
  • His strength finally failed him
    
  • His children failed him in the crisis
    

• deliver to an enemy by treachery
  • Judas sold Jesus
    
  • The spy betrayed his country
    

• reveal unintentionally
  • Her smile betrayed her true feelings
    

Related words

• Synonyms: 
  deceive , lead astray , cheat on , cheat , cuckold , wander , fail , sell , bewray