Italian word addosso comes from Italian dorso, Italian a- (Ad- (indication direction) A- (indicating lack or loss).)

Detailed word origin of addosso

Dictionary entry	Language	Definition
dorso	Italian (ita)	(swimming) backstroke. Back (of body, hand, book, etc). Ridge.
a-	Italian (ita)	Ad- (indication direction) A- (indicating lack or loss).
addosso	Italian (ita)	(followed by a) on, next to On (one's person).

Words with the same origin as addosso