(of a volcano) become active and eject lava, ash, and gases

Mount Pinatubo began erupting in June

break out suddenly and dramatically

fierce fighting erupted between the army and guerrillas

noise erupted from the drawing room

give vent to anger, amusement, etc. in a sudden and noisy way

the soldiers erupted in fits of laughter

(of a spot, rash, or other mark) suddenly appear on the skin

a boil had erupted on her temple

(of a tooth) break through the gums during normal development

the lower incisors had erupted