精せいを励はげます

expression, godan verb (-su)

make a great effort; exert oneself

Used when someone puts in serious, sustained effort, often for a goal or duty. The phrase has a slightly formal or literary feel.

• 彼かれは試し験けんに合ごう格かくするために精せいを励はげました。

  He made a great effort to pass the exam.

• 社しゃ員いんたちは新しん製せい品ひんの開かい発はつに精せいを励はげましている。

  The employees are exerting themselves in developing the new product.