We don't have synonyms for the backs yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are the sack, the oaks and the rack.
(N) :
a picturesque area to the east of Queen's Road in the city of Cambridge, England, where several colleges of the University of Cambridge back on to the River Cam with their grounds covering both banks of the river.
(N) :
a picturesque area to the east of Queen's Road in the city of Cambridge, England, where several colleges of the University of Cambridge back on to the River Cam with their grounds covering both banks of the river.