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