expression, suru verb (irregular)
work oneself to the bone; give one's all; make the utmost effort
Idiomatic expression literally meaning 'to grind one's body into dust'. Used to describe working extremely hard, often to the point of exhaustion. Similar to 身を粉にする (みをこにする), which is more common.
See also: 身を粉にする (みをこにする)
彼は家族のために体を粉にして働いた。
He worked himself to the bone for his family.
体を粉にする覚悟でこのプロジェクトに取り組む。
I will tackle this project with the determination to give it my all.