Definition of Grand Old Man noun from the Oxford Advanced Learner's Dictionary

 

Grand Old Man

 noun
noun
BrE
 
; NAmE
 
[usually singular](sometimes humorous)
 
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a title used to describe a man who has been involved in a particular activity for a long time at a high level. It was originally used to refer to William Gladstone, who spent many years in politics and was Prime Minister four times He is very much the Grand Old Man of Canadian literature.