endorse: [16] To endorse something is literally to write ‘on the back’ of it. The word comes from medieval Latin indorsāre, a compound verb formed from the prefix in- ‘in’ and dorsum ‘back’ (source of English dorsal, doss, and dossier). (An earlier English version of the word was endoss [14], acquired via Old French endosser, which died out in the 17th century.) => dorsal, doss, dossier[endorse etymology, endorse origin, 英语词源]