I. ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: Middle English, from Old English ūpspring, from ūp up + spring
1. archaic : an act or instance of springing up ; especially : origin , development , growth
2. obsolete : a wild dance
II. | ̷ ̷| ̷ ̷ intransitive verb
Etymology: Middle English upspringen, from up + springen to spring — more at spring
1.
a. : to spring up (as of a plant) : grow
b. : to come into existence : arise
a little corps of heroes has upsprung among us — Lippincott's Magazine
2. : to spring upward : rise ; specifically : to jump to one's feet