v. phr. , informal To show who has strength, courage and loyalty and find who do not. When the ship hit an iceberg and sank, it separated the men from the boys. The mile run separates the men from the boys.
SEPARATE THE MEN FROM THE BOYS
Meaning of SEPARATE THE MEN FROM THE BOYS in English
American idioms English vocabulary. Английский словарь американских идиом. 2012