The Collaborative International Dictionary
Upburst \Up"burst`\, n. The act of bursting upwards; a breaking through to the surface; an upbreak or uprush; as, an upburst of molten matter.
Wiktionary
n. The act of bursting upwards; a breaking through to the surface; an upbreak or uprush; as, an '''upburst''' of molten matter.
Usage examples of "upburst".
Scientists speculate that the sharpening of adverse conditions probably stimulated the first real upburst of Martian scientific progress.
The upburst gushed three stories into the sky, carrying with it scraps of circuit board, metal cables, and tattered gray overalls.
Here was ferocity, and savagery, but not of the wild, upbursting fury of the Celt.
First came the sprayers, pocking the ground with little upbursts of dirt, and shredding the morning silence with the noise of their grease guns.