separate/sort out the men from the boys

if a difficult situation or activity separates the men from the boys, it shows which people in a group are brave and strong and which are not.

You have to survive outdoors for three days and three nights. That should separate the men from the boys.

• cut teeth in
• cut teeth in something
• cut the cord
• cut the crap
• Cut the crap!
• cut the Gordian knot
• cut the ground from under feet
• cut the ground from under someone feet
• cut the ground from under someone's feet
• cut the umbilical cord
• cut things fine
• cut through
• cut through like a hot knife through butter
• cut through like a knife through butter
• cut through something
• cut through something like a hot knife through butter
• cut through something like a knife through butter
• cut to the chase
• cut to the quick
• cut two ways
• cut up rough
• cut your coat according to cloth
• cut your coat according to your cloth
• cut your losses
• cut your own throat