What does the word 「でやんして」 mean?


I also would like to know if it relates to any dialect.

> A: またそんなことでこそこそやってるのか。  
>  B: なんせ 我々にとっては重大{じゅうだい}問題{もんだい} **でやんして**...




Yes, it is a dialect, and it is an old one. A quick equivalency would be:

でやんす = で ございます

でやんして = で ございまして

我々にとっては重大問題でやんして = 我々にとっては重大問題でございまして

Here's a good description from the home page of Sano city, Gifu prefecture
which digs a bit into the grammar of it. Since it's on the city's site as an
introduction of the regional culture, I imagine it is done by proper authority
of the field, so I would defer the technical aspects of it to this page.

<https://www.city.sano.lg.jp/soshikiichiran/sougou/toshibrandsuishin/gyomuannai/koho/7/2023/21145.html>

