An Etymological Dictionary of the German Language/auf

by Friedrich Kluge

auf, adv., prep., ‘up, upwards, on, upon,’ from MidHG. and OHG. ûf, adv., prep., ‘upon’; corresponds to OSax. ûp, AS. ûp-ū̆pp, and its equiv. E. up; Goth. iup, adv., ‘upwards, aloft,’ differs remarkably in its vowel. Probably primit. Teut. *ū̆ppa, ‘up,’ is allied to oben and über.