noun Date: 1868 an alumnus especially of a boys' school, a man who is a member of a long-standing and usually influential clique especially in a professional, business, or social sphere
OLD BOY
Meaning of OLD BOY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012