Definition of "upgrowth"

The thorough and shameless commercialism of Sex has alas! been reserved for what is called "Christian civilization," and with it (perhaps as a necessary consequence) Prostitution and Syphilis have grown into appalling evils, accompanied by a gigantic degradation of social standards, and upgrowth of petty Philistinism and niaiserie.

1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 188

the new and mighty upgrowth of poetry in Italy

J. R. Green