刻こっ苦く精しょう進じん

noun, noun or participle which takes 'suru'

strenuous effort; diligent work enduring hardships

A yojijukugo describing intense, persevering effort in the face of difficulty. Often used in formal or literary contexts to praise dedication.

• 彼かれは刻こっ苦く精しょう進じんの末すえ、ついに難なん関かん試し験けんに合ごう格かくした。

  After strenuous effort, he finally passed the difficult exam.

• 刻こっ苦く精しょう進じんして技ぎ術じゅつを磨みがく。

  Polish one's skills through diligent work and hardship.