From Longman Dictionary of Contemporary Englishold boyˈold ˈboy noun [countable] 1 British EnglishSES a man who used to be a student at a school an old boys’ reunion2 → the old-boy network3 British English spokenOLD/NOT YOUNG an old man He’s a nice old boy.4 British English old-fashionedFRIEND used when speaking to a male friend How are you, old boy? → old girl
