The Collaborative International Dictionary
Upgrowth \Up"growth`\, n. The process or result of growing up; progress; development.
The new and mighty upgrowth of poetry in Italy.
--J. R.
Green.
Wiktionary
n. The process or result of growing up; progress; development.
Usage examples of "upgrowth".
Then again another acute and startling outbreak, a swift upgrowth of monstrous weedy thickets, a drifting dissemination about the world of inhumanly growing thistles, of cockroaches men fought with shot guns, or a plague of mighty flies.
In this way, growing at its edge, deepening, and contributing to an upgrowth from the bottom, a few centuries may serve entirely to fill a deep basin with peaty accumulation.
And around and above us the trees-I had never seen such monstrous upgrowths of vegetable rioting, gnarled and twisted, but as lofty as spires.