‘冒烟’ literally means ‘to emit smoke’ and functions as a verb describing the visible release of smoke from a source. The character 冒 (mào) conveys the idea of something rising or emerging outward, while 烟 (yān) means ‘smoke’. Together, they form a compound verb indicating that smoke is actively coming out—often signaling overheating, malfunction, or combustion. It’s commonly used in both literal and figurative contexts: literally for machines, wires, or food burning; figuratively to describe someone becoming extremely angry (e.g., ‘他气得直冒烟’ — ‘He was so angry he was steaming’).

This term appears frequently in safety warnings, technical descriptions, and casual speech. While it can describe natural phenomena like volcanoes, its most typical usage involves human-made objects (engines, stoves, electronics) or emotional states. Unlike the noun ‘smoke’ (烟), ‘冒烟’ emphasizes the *action* of emission—not the substance itself—and always requires an agent or subject performing the action.