things left undone; unfinished business
Refers to tasks, work, or matters that remain incomplete or were not done. Often used with a sense of regret or as a reminder.
I have to take care of the things I left undone today.
Let's check the list so that nothing is left undone.
Full kanji spelling; less common and may appear in formal or literary contexts.
Compound of the verb stem やり (from やる 'to do') and 残し (from のこす 'to leave behind').