be·tray/bɪ`tre; bɪˈtreɪ/ v [T] 1 to behave dishonestly towards someone who loves you, trusts you, or supports you, or do something that will cause problems for them 出卖，背叛〔某人〕: We all feel that Charles has betrayed us. 我们都觉得查理斯背叛了我们。 2 to tell people secrets that harm your country, party, company etc 泄露〔机密〕; 叛国 3 to let people see an emotion that you were trying to hide 暴露〔真实感情〕: Her face betrayed no hint of her nervousness. 她的脸上没有露出一丝紧张不安的神色。