2. (3) betray, sell -- (deliver to an enemy by treachery; "Judas sold Jesus"; "The spy betrayed his country")
3. (2) fail, betray -- (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")
4. (1) cheat on, cheat, cuckold, betray, wander -- (be sexually unfaithful to one's partner in marriage; "She cheats on her husband"; "Might her husband be wandering?")
5. (1) denounce, tell on, betray, give away, rat, grass, shit, shop, snitch, stag -- (give away information about somebody; "He told on his classmate who had cheated on the exam")
6. deceive, betray, lead astray -- (cause someone to believe an untruth; "The insurance company deceived me when they told me they were covering my house")