addorse means to place back-to-back, to place with the back to (something else's back). Lexicurio rates it Sui generis — a strength score of 95 out of 100.
verb
- To place back-to-back, to place with the back to (something else's back).“I replied (out of a former letter from your Lordship) with some marvel why this Signory did not by their own resident in England motion the matter to the resident there of the States rather than addorse it upon his Majesty.”