upgrowth \ˈ ̷ ̷ˌ ̷ ̷\noun 1.: the process of growing up : upward growth : development < the upgrowth of the atolls during a rising sea level — F.P.Shepard > < a tremendous upgrowth of science and practical arts — I.J.Fellner > 2.: a result of upward growth or development; specifically: process 4