noun
parenthetic sentence; inserted sentence
A sentence inserted into another sentence, often set off by parentheses, dashes, or commas. Used in grammar and writing contexts.
この文章では、挿入文がダッシュで囲まれている。
In this text, the parenthetic sentence is enclosed by dashes.
Compound of 挿入 (そうにゅう, 'insertion') and 文 (ぶん, 'sentence').