אויף 2
'up (adverb)'

ETYMOLOGY

[Kroonen writes that the long vowel in OHG ūf (thus the diphthong in NHG auf and Yiddish אויף) arose from monosyllabic lengthening.
DW² notes that the vowel remained short in many dialects outside of Bavarian - perhaps that explains Northeastern Yiddish /uf/ (adv.). Also eastern Upper German and East Middle German af - perhaps that explains Northeastern Yiddish /af/ (prep.). Bavarian seems to have had a greater influence on Central Yiddish, which perhaps explains why the main form is /ɔuf/ (adv.)}
Got. iup, ON upp, OE up, English up, OS ū̆p, Dutch op (adv., prep.), OHG ūf, MHG ūf, ouf, uf, NHG auf (adv., prep.); from PGmc ✱eup ~ ✱upp 'up, upwards (adv.) (or ✱up(a))' < ✱(h₁e)up-n- (DRV?) (or ✱upo).
Related: Sanskrit úpa, Hittite upzi '(the sun) rises', Greek ὑπό (prep.) 'below', ὕπο (adv.) 'below'

WESTERN

Old Literary Yiddish (ca. 1100-1800)

אונ' איז אלז אין אים הין אונ' ווידר גילאפֿן אויף אונ' אב
'and ran constantly back and forth in him up and down'

Alsace (France)

mʁ̩- syːɣə nə niː ʊf מיר זוכן אין ני אויף 'we never visit him' {ALSACE, 47075 Mulhouse, 009-080}