[ verb uhp-spring, noun uhp-spring ]
/ verb ʌpˈsprɪŋ, noun ˈʌpˌsprɪŋ /

verb (used without object), up·sprang or up·sprung, up·sprung, up·spring·ing.

to spring up.
to come into being or existence; arise: Prosperity began to upspring after the war.

noun Archaic.

growth or development.
a coming into existence; origin.

Origin of upspring

before 1000; (v.) Middle English upspringen, Old English upspringan; (noun) Middle English; Old English upspringe. See up-, spring Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for upspring

/ archaic, or literary /

verb (ʌpˈsprɪŋ) -springs, -springing, -sprang, -sprung or -sprung

(intr) to spring up or come into existence

noun (ˈʌpˌsprɪŋ)

a leap forwards or upwards
the act of coming into existence
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012