1To make a great effort; to work hard or take pains to achieve something.
彼はプロジェクトの成功のために骨折って働いた。
He worked hard and went to great lengths for the project's success.
上司に認めてもらうために、毎日骨折って勉強した。
I studied diligently every day to gain recognition from my boss.
チームの調整で事務スタッフが骨折ってくれたおかげだ。
It's thanks to the office staff who took pains to coordinate the team.