blow cover
露出真面目、揭穿、暴露或泄露隐藏的秘密或真相
口语·用于秘密行动或隐瞒身份的场景
英文释义
to reveal or expose one's true identity or intentions
例句
The spy's disguise was perfect until a phone call blew his cover during the mission.
典故来源
源自间谍或特工术语，指隐藏身份被意外暴露，如同伪装被风吹开一样。