Origin: before 950;Middle Englishafte,Old Englishæftan from behind, equivalent to æf- opposite + -t- suffix of uncertain value + -an suffix marking motion from; cognate with Old Frisianefta,Old Saxon,Old High Germanaftan,Gothicaftana,Old Norseaptan,Greekopís(s)ō behind; not akin to Greekapóoff
O.E. æftan "behind, farthest back," from superl. of O.E. æf, af, of "off," from P.Gmc. *af-, from PIE root *apo- "off, away" (cf. Goth. aftana "from behind;" see apo-). Now purely nautical.