1.
to be hard work; to take great effort
Said of a task that demands great effort; literally 'the bones break.' 骨の折れる仕事 is a laborious job. The transitive 骨を折る means to take pains, usually on someone else's behalf. The phrase can also be literal: to break a bone.
Literally 'the bones break' under the effort. The literal sense, to break a bone, also exists; context decides.
Common patterns
Similar words
Related Words
Pair verb:
骨を折る (to take pains (transitive))
Related:
骨 (bone)
Compare:
大変 (hard, tough)