Sudden violent occurrences, like when a volcano explodes, or when a rash appears suddenly on skin.
From Latin 'eruptio,' combining 'e-' (out) and 'rumpere' (to break). Romans used it to describe volcanoes but also sudden social upheaval.
Mount Vesuvius's eruption in 79 AD killed thousands of Romans in minutes—volcanic ash essentially created a time capsule, preserving Pompeii so completely that we can see graffiti and food from ancient Rome.
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