急事 (jí shì) literally combines 急 (jí), meaning 'urgent' or 'hurried', and 事 (shì), meaning 'matter' or 'affair'. Together, they form a compound noun meaning 'urgent matter' — something that requires immediate attention or action. It is commonly used in both spoken and written Chinese to refer to pressing personal, professional, or family-related matters.

This word often appears in contexts involving time sensitivity, such as explaining an absence ('I have an urgent matter to attend to'), justifying a delay, or describing unexpected disruptions to plans. Unlike more formal terms like 紧急事务 (jǐn jí shì wù), 急事 is neutral in register — appropriate for everyday conversation with colleagues, friends, or family, but not overly casual. It implies seriousness without dramatic urgency, making it versatile yet restrained.