leaving behind; omission; leftover
Refers to the act or state of leaving something or someone behind, or an item that has been left behind. Often used in contexts of forgetting to take something, or a remnant from a process.
When moving, I checked to make sure no books were left behind.
データの取り残しがあると、集計がずれる。
If there are omissions in the data, the totals will be off.