Meaning of “old boy” in the English Dictionary

"old boy" in British English

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old boynoun

uk /ˌəʊld ˈbɔɪ/ us /ˌoʊld ˈbɔɪ/

old boy noun (STUDENT)

[ C ] UK An old boy of a particular school is a man who went to school there as a child:

an old-boy reunion

(Definition of “old boy” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)