Longman Dictionary of Contemporary English homepage

old boy

 noun
     
Related topics: School
old boy [countable]
1 British EnglishSES a man who used to be a student at a school:
an old boys' reunion
2

the old-boy network

SES the system by which men who went to the same school, belong to the same club etc use their influence to help each other
3 British English spoken an old man:
He's a nice old boy.
4 British English old-fashioned used when speaking to a male friend:
How are you, old boy?
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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