old-boy network

[ ohld-boi ]
/ ˈoʊldˈbɔɪ /

noun

an exclusive network that links members of a profession, social class, or organization or the alumni of a particular school through which the individuals assist one another in business, politics, etc.

Origin of old-boy network

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019