v reveal unintentionally
v deliver to an enemy by treachery
v disappoint, prove undependable to; abandon, forsake
v be sexually unfaithful to one's partner in marriage
v give away information about somebody
v cause someone to believe an untruth
v. 对…不忠( betray的过去式和过去分词 ); 背叛; 出卖; 泄露