blow someone's cover
US /bloʊ ˈsʌm.wʌnz ˈkʌv.ər/
UK /bloʊ ˈsʌm.wʌnz ˈkʌv.ər/
1.
暴露某人的身份, 揭露某人的秘密
to reveal someone's true identity or secret activity, especially when they are trying to keep it hidden
:
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The spy's partner accidentally blew his cover by calling him by his real name in public.
间谍的搭档在公共场合叫了他的真名，无意中暴露了他的身份。
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She tried to keep her new job a secret, but her excited friend blew her cover on social media.
她试图对新工作保密，但她兴奋的朋友在社交媒体上暴露了她的秘密。