noun
overwrite mode
A text input mode where newly typed characters replace existing characters at the cursor, as opposed to insert mode.
上書きモードに切り替えるには、Insertキーを押してください。
To switch to overwrite mode, press the Insert key.
Insert mode, where typed characters are inserted at the cursor without deleting existing text. The opposite of overwrite mode.
Compound of 上書き (overwrite) and モード (mode), a straightforward computing term.