The origin is uncertain. The only parallel adduced by Leslau is ṭofḥ ‘der Rücken; die stumpfe Seite der einschneidigen Schwertklinge’ from the Arabic dialect of Dhofar (Rhodokanakis 36), which, in view of its isolated charater, may well be due to MSA influence. Any connection with PWS *ṭapḥ- ‘span, palm of the hand,’ tentatively supposed in SED I No. 279, is unlikely. (Kogan 2015:574)