To endeavor, strive, or make an effort to do something — to try hard or devote oneself to achieving a goal.
彼は英語の上達に努めている。
He is striving to improve his English.
社員は常に品質向上に努めなければならない。
Employees must always work to improve quality.
私たちは地域社会の発展に努めます。
We will strive for the development of the local community.