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... A narrative technique in which lines are spoken in sync with the rhythm of shamisen music played on the strings. Iregoto is a screenplay term. It refers to the insertion of lines or scenes that are not in the original work.

*Some of the terminology explanations that mention "Iriuji" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　糸に乗る三味線音楽のリズムに合致させてせりふを述べる〈語り〉の表現技巧。　入事（いれごと）脚本用語。原作にないせりふや演出を入れること。…

※「入事」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報