adv. Obs. rare. Also uponan. [f. UPON prep. + ONE pron. 30 f.] = ANON adv. 4.
c. 1400. Destr. Troy, 2418. I onswaret hym esely euyn vponon. Ibid., 6712. Polidamas can fight, With his Enmeis full egurly, euer vpon-one.