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
1. She felt betrayed when her friend shared her secret.
当她的朋友泄露了她的秘密时，她感到被背叛了。
2. He betrayed his country by leaking sensitive information.
他通过泄露敏感信息背叛了自己的国家。
3. After the betrayal, their friendship was never the same again.
在背叛之后，他们的友谊再也不一样了。