精せいを出だす

expression, godan verb (-su)

work hard; put in effort; do one's best

Used when someone applies themselves diligently to a task, often over a period of time. Conveys steady, earnest effort rather than a single burst of energy.

• 彼かれは毎まい日にち遅おそくまで精せいを出だして働はたらいている。

  He works hard until late every day.