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
He serves as a secretary for the university's old boys' association.
The old boys of that soccer team got together and played a friendly match.
Variant with interpunct; less common but still seen.
Loanword from English 'old boy', referring to a male former student or member of an institution.