expression, noun
things to do; one's duty; what must be done
A set phrase meaning tasks or obligations one should carry out. Often used in contexts of responsibility, planning, or moral duty.
今日のなすべきことをリストにまとめた。
I listed the things I need to do today.
彼は自分のなすべきことを黙ってやり遂げた。
He quietly carried out what he had to do.
More casual and concrete than なすべきこと, which often carries a slightly formal or moral nuance.
A formal noun meaning 'duty' or 'obligation'; なすべきこと is a softer, phrase-like expression for things one ought to do.
A phrase composed of the classical verb 成す (なす, 'to accomplish') + the classical auxiliary べき (indicating obligation) + こと ('thing'). The combination is a fixed expression meaning 'things that should be done'.