official secret

noun
🔊/əˌfɪʃl ˈsiːkrət/
🔊/əˌfɪʃl ˈsiːkrət/
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  1. (in the UK) a piece of information known only to the government and some of its employees, which it is illegal for them to tell anyone under the Official Secrets Act公务秘密(英国 “公务秘密法” 禁止政府工作人员泄露的信息)