betray

(verb) reveal unintentionally. Synonyms: bewray. Examples: "Her smile betrayed her true feelings."

(verb) deliver to an enemy by treachery. Synonyms: sell. Examples: "Judas sold jesus." "The spy betrayed his country."

(verb) disappoint, prove undependable to; abandon, forsake. Synonyms: fail. Examples: "His sense of smell failed him this time." "His strength finally failed him." "His children failed him in the crisis."

(verb) be sexually unfaithful to one's partner in marriage. Synonyms: cheat on, cheat, cuckold, wander. Examples: "She cheats on her husband." "Might her husband be wandering?."

(verb) give away information about somebody. Synonyms: denounce, tell on, give away, rat, grass, shit, shop, snitch, stag. Examples: "He told on his classmate who had cheated on the exam."

(verb) cause someone to believe an untruth. Synonyms: deceive, lead astray. Examples: "The insurance company deceived me when they told me they were covering my house."