Definition of back-breaking adjective from the Oxford Advanced Learner's Dictionary

 

back-breaking

 adjective
adjective
BrE
 
; NAmE
 
Describing work
 
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(of physical work) very hard and tiring She realized with dismay that the task would take weeks of back-breaking work. More Like This Descriptive compound adjectives with parts of the body back-breaking, ear-splitting, eye-popping, gut-wrenching, hair-raising, lung-busting, jaw-dropping, mind-boggling, nail-biting, rib-tickling, side-splitting, spine-chilling, stomach-churning, toe-curlingSee worksheet. See related entries: Describing workExtra examples She realized with dismay that the task would take weeks of back-breaking work.
See the Oxford Advanced American Dictionary entry: back-breaking