erupt

Concise Oxford English Dictionary © 2008 Oxford University Press:
erupt/ɪˈrʌpt/

▶verb

• 1 (of a volcano) forcefully eject lava, rocks, ash, or gases.

• 2 break out suddenly: fierce fighting erupted.

• 3 (often erupt in) give vent to feelings in a sudden and noisy way: they erupted in fits of laughter.

• 4 (of a spot, rash, etc.) suddenly appear on the skin.

• 5 (of a tooth) break through the gums.

– derivatives
eruptive adjective.

– origin C17: from L. erupt-, erumpere ‘break out’.