upˈstreaming,pres.pple.andppl.a. (up- 6, 6 b.) 1849M. Arnold Resignation 62 There [it] winds, upstreaming slowly still Over the summit of the hill.1884Geikie Phys.Geog. (ed. 2) 87 A zone, in which the currents would meet and ascend as an upstreaming mass of air.