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English definition of “old boy”

old boy

noun (OLD MAN)   
[C] mainly UK informal an old man: the old boy next doorThe elderlyOld or old-fashionedDescribing people who are old [as form of address] old-fashioned a way that some men address male friends that they have known for many years: Come on, old boy, drink up.The elderlyOld or old-fashionedDescribing people who are old
(Definition of old boy noun (OLD MAN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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