/tɒp ˈsiːkrɪt/ – Phrase
Definition: tuyệt mật.
A more thorough explanation: “Top secret” is a classification level used by governments and organizations to designate information that is considered highly sensitive and restricted from unauthorized access. This classification is typically used to protect national security or other critical interests, and access to top secret information is limited to authorized personnel who have the necessary security clearance. Unauthorized disclosure of top secret information can result in severe legal consequences.
Example: The document containing the top secret information was securely stored in a locked cabinet.