אָפּ־ 2
'off (verbal prefix)'

ETYMOLOGY

Why is the final consonant devoiced /p/?
Got. af, ON af, OE æf, of, OS af, OHG aba, ab; from PGmc ✱aba; from PIE ✱h₂ep-ó cf. Sanskrit ápa, Greek ἀπό, Latin ab, Hittite appā, Old Church Slavonic po