'Duì bu qǐ' is a fundamental expression of apology or polite interruption in Chinese. Literally, 'duì' means 'correct' or 'right', 'bù' is the negation 'not', and 'qǐ' means 'to rise' or 'to stand up' — together, the phrase historically conveys the idea of 'I am not standing (or acting) correctly', implying humility and acknowledgment of fault or inconvenience. It’s used both formally and informally across all ages and social settings.

This phrase functions as a standalone interjection — it rarely appears inside complex clauses and almost never takes verb endings like -le or -guo. It’s appropriate for minor mishaps (bumping into someone), delays (arriving late), requests (getting someone’s attention), or expressing regret (breaking a promise). Unlike English 'sorry', it carries no inherent legal or emotional weight — its sincerity depends entirely on tone and context, not grammatical form.