当事者 – vocab dash

being an involved party; degree to which one is involved (in a matter); degree to which one is affected (by an issue); (degree of) involvement; (degree of) connectedness; relevancy (to one)

Noun

当とう事じ者しゃ意い識しき

sense of involvement (e.g. in a movement); consciousness of being a participant

Noun

Examples9

彼かれは両りょう当とう事じ者しゃの間あいだを調ちょう停ていした。

He mediated between the two parties.

当とう事じ者しゃ同どう士しの話はなし合あいがもっと必ひつ要ようだ。

There should be more communication between the persons concerned.

住じゅう民みんは当とう事じ者しゃに背そむいた。

The inhabitants rebelled against the ruler.

この契けい約やくは当とう事じ者しゃ全ぜん部ぶが履り行こうすべきものである。

This agreement is binding on all parties.

当とう事じ者しゃが公こう証しょう役やく場ばに行いく場ば合あい、下か記きのものが必ひつ要ようになります。

When one goes to the notary public's office, the following are required.

お前まえは当とう事じ者しゃじゃないから、そんなのんきなこと言いってられるんだよ。

You wouldn't be so casual about it if you were directly involved.