(1):
(n.) The act of breaking out or bursting forth; as: (a) A violent throwing out of flames, lava, etc., as from a volcano of a fissure in the earth's crust. (b) A sudden and overwhelming hostile movement of armed men from one country to another. Milton. (c) A violent commotion.
(2):
(n.) That which bursts forth.
(3):
(n.) The breaking out of pimples, or an efflorescence, as in measles, scarlatina, etc.
(4):
(n.) A violent exclamation; ejaculation.