オールドボーイ

noun

old boy; alumnus; former member

Refers to a male graduate or former member of a school, club, or organization. Often used in contexts like school alumni associations or sports team alumni. The term is a direct loan from English 'old boy' and carries a similar connotation of camaraderie and shared history.

See also: ＯＢ

• 彼かれは大だい学がくのオールドボーイ会かいの幹かん事じをしている。

  He serves as a secretary for the university's old boys' association.

• そのサッカーチームのオールドボーイが集あつまって親しん善ぜん試合じあいをした。

  The old boys of that soccer team got together and played a friendly match.