off-
From Middle English of-, from Old English of-, æf- (“off, away, down, un-”), from Proto-Germanic *af- (“off, away”), from Proto-Indo-European *apo- (“off, away”). Cognate with Dutch af- (“off, away, down”), German ab- (“off, from, down”), Latin ab- (“from, of”), Ancient Greek απο- (apo-, “away from, without”).
