a man of the highest status or power within a group, as a leader
The idea of a "big man" actually comes from the concept of the leader in American Subarctic cultures.
He was a big man with a big engine and big things to do, no matter what the hell anyone else thought.
The big man, Chris Christie, beats the thin man, Jon Corzine.
“Vlade Divac did what every big man has been taught their entire life – get the ball away from the basket,” Pollard said.
A male school or campus leader: the prep school ''big man'' (1920s+ Students)