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the aforementioned; the said; (man, incident, etc.) in question; the above-mentioned; the aforesaid
the usual
くだんの人物が会議に姿を現した。
The aforementioned person showed up at the meeting.
くだんの件について報告があります。
I have a report regarding the matter in question.
くだんの書類を確認してもらえますか?
Could you check those documents we discussed for me?