betray
/bɪˈtreɪ; bɪ`tre/ v
1 [Tn, Tn.pr]
~ sb/sth (to sb) hand over or show sb/sth disloyally (to an enemy) （向敌人）出卖某人或泄漏某事
betraying state secrets 泄漏国家机密
Judas betrayed Jesus (to the authorities). 犹大（向当局）出卖了耶稣.
2 [Tn] be disloyal to (sth) 背叛（某事物）
betray one's country, one's principles 背叛自己的国家、自己的原则
In failing to return the money he betrayed our trust. 他未能归还那笔钱而辜负了我们的信任.
3 [Tn]
(a) show (sth) unintentionally; be a sign of 无意中显示出（某事物）; 显露出; 表现出
She said she was sorry, but her eyes betrayed her secret delight. 她说她很难过, 但从她的眼神里却流露出她内心的喜悦.
His accent betrayed the fact that he was foreign. 他的口音显露出他是外国人.
(b) ~ oneself show what or who one really is 暴露出本来面目
He had a good disguise, but as soon as he spoke he betrayed himself, ie he was recognized by his voice. 他伪装得很好, 可是一说话就原形毕露了（听他的声音就能认出他来）.