最さい古こ参さん

noun, noun which may take the genitive case particle 'no'

oldest member; longest-serving member

Refers to the person who has been in a group, organization, or team the longest. Often used in workplace or military contexts.

• 彼かれはこの部ぶ署しょの最さい古こ参さんだ。

  He is the longest-serving member of this department.

• 最さい古こ参さんの社しゃ員いんとして、会かい社しゃの歴れき史しをよく知しっている。

  As the oldest member of the company, he knows its history well.