■ verb
1》 (of a volcano) forcefully eject lava, rocks, ash, or gases.
2》 break out suddenly: fierce fighting ~ed.
3》 (often ~ in ) give vent to feelings in a sudden and noisy way: they ~ed in fits of laughter.
4》 (of a spot, rash, etc.) suddenly appear on the skin.
5》 (of a tooth) break through the gums.
Derivatives
~ive adjective
Origin
C17: from L. ~- , erumpere 'break out'.