谨记 is a formal, literary verb meaning 'to bear in mind solemnly' or 'to remember earnestly and with due respect.' The character 谨 (jǐn) conveys carefulness, reverence, and seriousness — often implying moral or ethical weight. The character 记 (jì) means 'to remember' or 'to keep in mind.' Together, they form a compound that emphasizes not just mental recall, but also conscientious, respectful adherence to something important — such as advice, a warning, a principle, or a promise.

This word appears frequently in written Chinese: official notices, speeches, classical-style admonitions, and moral exhortations. It carries a tone of gravity and sincerity, rarely used in casual speech. Learners should note that 谨记 is typically followed by a noun phrase or clause introduced by that (that/what), or directly by the thing to be remembered — e.g., 谨记教训 (bear the lesson in mind) or 谨记：安全第一 (Bear in mind: safety first).