• אַף (af)

From Middle High German ūf, from Old High German ūf, from Proto-Germanic *upp.

• (YIVO) IPA^(key): /af/
• (Northeastern) IPA^(key): /af/
• (Poylish) IPA^(key): /ɔf/

אויף • (oyf) (contracted dem-form אויפֿן (oyfn))

1. on, upon
2. in (a language)

   ווי אַזוי זאָגט מען „אוי“ אויף ענגליש?

   vi azoy zogt men „oy“ oyf english?

   So how do you say "oy" in English?

3. at (an occasion)
4. by (a unit; multiplication)
5. for (a time or purpose)

Although some works will transliterate this word according to its pronunciation (for example, as af), YIVO recommends that it always be transliterated according to its spelling as oyf.

• אויג אויף אויג (oyg oyf oyg, “face to face, privately”)