1. vt.背叛，出卖　 be disloyal to; give away or make know or sell treacherously
2. vt.泄露，流露　 allow (a secret) to become known, either by accident or on purpose

　～ sb's brothers　出卖某人的亲兄弟
　～ sb's character　暴露出某人的品格卑贱
　～ one's country　卖国
　～ a feeling　流露出感情
　～ one's friends　出卖朋友
　～ sb's hiding-place　告发某人的匿藏地
　～ one's ignorance　暴露自己的无知
　～ intension　暴露某人的意图
　～ oneself　暴露真相
　～ a plan　泄露计划
　～ principles　背叛原则
　～ a secret　泄露秘密
　～ sb's true nature　流露出某人的天性
　～ sb's trust　辜负某人的信任
　～ soon　很快暴露
　～ bluntly　坦率地流露
　～ deliberately　故意背叛
　～ easily　轻易暴露
　～ emotionally　激动地流露
　～ grossly　完全背叛
　～ heartlessly　残忍地出卖
　～ hideously　丑陋地流露
　～ incautiously　轻易地流露
　～ infrequently　罕见地流露
　～ mentally　出卖灵魂
　～ viciously　恶意地背叛
　～ virtually　真实流露
　～...by sth　通过…而暴露…
　～ by stammering　因结结巴巴地说而暴露了
　～ sb into　把某人出卖给
　～...to　把…出卖给

　He betrayed his own brother.　他出卖了他的亲兄弟。
　He promised never to betray her.　他发誓永不背叛她。
　His best friend betrayed him.　他最好的朋友出卖了他。
　Her ethics would never allow her to betray a friend.　她的伦理观不容许她背叛朋友。
　He had a good disguise, but as soon as he spoke he betrayed himself.　他伪装得很好，但是他一说话就露了马脚。
　He betrayed the secret by accident.　他无意中泄露了秘密。
　Her pale face betrayed her fear.　她苍白的脸显露出她的恐惧。
　His face betrayed his grief.　他的表情流露出内心的悲伤。
　His mistakes betrayed his lack of education.　他的种种错误显示出他缺乏教育。
　Although she often seems quite cold and harsh, her smiling eyes betray her true nature.　虽然她表面上显得冷冰冰又很严肃，但她微笑的眼睛却流露出真诚的天性。
　The house betrays its old age.　那房子显得很旧了。
　The mistakes betray that he does not know grammar.　那些错误表明他不懂语法。

 ♣ betray by　(v.+prep.)
　因…而暴露　reveal by
　He betrayed his intension by his behaviour.　他的行为泄露了他的意图。
　He betrayed nervousness by stammering.　他说话结结巴巴说明他胆子小。
 ♣ betray into　(v.+prep.)
　诱入　tempt (sb) into
　I was betrayed into folly.　我受蒙骗而做蠢事。
　He was once betrayed into error.　他曾受蒙骗而犯过错误。
　She was betrayed into a snare.　她被诱入陷阱。
 ♣ betray to　(v.+prep.)
　将…出卖〔泄露〕给　sell out (sth) to (sb)
　He betrayed us to the enemy.　他把我们出卖给敌人。
　He betrayed the news to all his friends.　他把这一消息告诉了他所有的朋友。
　For years, they betrayed Britain's secrets to Russia.　几年来，他们一直向俄国泄露英国的秘密。
　Her trembling hands betrayed her nervousness to him.　她颤抖的双手向他表明了她的紧张不安。

 ♣ betray, disclose, discover, divulge, expose, reveal
　参见reveal条。