‘喷发’ literally combines 喷 (pēn, 'to spurt' or 'to eject forcefully') and 发 (fā, here meaning 'to occur' or 'to break out'). Together, it describes a sudden, powerful release of material—most commonly volcanic magma, ash, and gas during a volcanic eruption. It emphasizes both the force and the onset of the event.

Beyond geology, 喷发 is also used figuratively for intense, rapid outbursts: emotions (e.g., anger or laughter), creative energy, or even biological phenomena like sneezing fits or plant pollen release. It’s more dramatic and dynamic than generic words like ‘happen’ or ‘occur’, and often implies unpredictability and intensity. While it can describe natural processes in plants (e.g., sudden flowering or seed dispersal under pressure), its most frequent context remains volcanoes and emotional/physical surges.