old boy . old boy or old chap {n.}, {chiefly British} One of the men educated at the same institution and bound by strong ties of loyalty to each other. He got the job because the boss was another old boy. Categories: add yours {Chiefly British} {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: O Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry