/ˈʌndər sil əv ˈsiːkrəsi/ – Phrase
Definition: có đóng dấu mật.
A more thorough explanation: “Under seal of secrecy” refers to information or documents that are kept confidential or private by legal authority or agreement. This term typically implies that the information is protected by a formal seal or legal obligation to maintain secrecy.
Example: The employee signed a confidentiality agreement under seal of secrecy, promising not to disclose any proprietary information to third parties.