Erupting means suddenly and violently bursting out or spewing out.
When we think about erupting, we often think of volcanoes. Volcanoes are like giant mountains that erupt with huge amounts of lava and ash when they're active. But the word is used in other contexts too. For example, you might hear someone say a problem is erupting at work because it's suddenly become a big issue. Or maybe your friend has been quiet for days but then erupts into laughter after hearing a funny joke. The idea is that something sudden and powerful happens, like a volcano eruption or a burst of emotion. It can also describe the sound of a loud explosion or a sudden release of energy.
To eject something violently (such as lava or water, as from a volcano or geyser).
Example: The volcano erupted, spewing lava across a wide area.
