You say that someone erupts when they suddenly have a change in mood, usually becoming quite noisy. Then, without warning, she erupts into laughter + eruption erup·tion an eruption of despair
When a volcano erupts, it throws out a lot of hot, melted rock called lava, as well as ash and steam. The volcano erupted in 1980, devastating a large area of Washington state + eruption eruptions erup·tion the volcanic eruption of Tambora in 1815
force out or release suddenly and often violently something pent up; "break into tears"; "erupt in anger"
appear on the skin; "A rash erupted on her arms after she had touched the exotic plant"
If violence or fighting erupts, it suddenly begins or gets worse in an unexpected, violent way. Heavy fighting erupted there today after a two-day cease-fire = break out + eruption erup·tion this sudden eruption of violence
start to burn or burst into flames; "Marsh gases ignited suddenly"; "The oily rags combusted spontaneously"
start to burn or burst into flames; "Marsh gases ignited suddenly"; "The oily rags combusted spontaneously
If your skin erupts, sores or spots suddenly appear there. At the end of the second week, my skin erupted in pimples. + eruption erup·tion eruptions of adolescent acne