251Japanese idiom 四字熟語
粉骨砕身
ふんこつさいしんFunkotsu saishin
“Grinding one's bones, crushing one's body.”
The meaning
Giving yourself without reserve to a task that deserves it. The hyperbole says something true: some works are only done wholeheartedly — provided you choose which.
At the origin
The four-character idiom of total effort.
The characters
In practice
Reserve total commitment for what deserves it; the rest, do well, no more.