n. The act of breaking out or bursting forthn. A violent throwing out of flames, lava, etc., as from a volcano or a fissure in the earth's crust.n. A sudden and overwhelming hostile movement of armed men from one country to another.n. A violent commotion.n. That which bursts forth.n. A violent exclamation; ejaculation.n. The breaking out of pimples, or an efflorescence, as in measles, scarlatina, etc.