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verb [no object]
(of a volcano) become active and eject lava, ash, and gases:Mount Pinatubo began erupting in June be ejected from an active volcano:hot lava erupted from the crust (of an object) explode with fire and noise resembling an active volcano:smoke bombs erupted everywhere break out or burst forth suddenly and dramatically:fierce fighting erupted between the army and guerrillas cheers erupted from the crowd give vent to anger, enthusiasm, amusement, or other feelings in a sudden and noisy way:the soldiers erupted in fits of laughter (of a pimple, rash, or other prominent mark) suddenly appear on the skin. (of the skin) suddenly develop a pimple, rash, or mark. (of a tooth) break through the gums during normal development.