Dictionary / Vocabulary / 勤しむ
いそしむ
to work hard at; to devote oneself to; to be diligent in
・・・さあ、今日も勉学に勤しもうか。
Well, shall we devote ourselves to study today as well?
彼は、科学者なるために勉学に勤しんだ。
He studied hard to become a scientist.