know who's who

know who's who

To know details about or have connections with everyone or many people in a group. Usually used in relation to groups of rich, powerful, or famous people. I feel like a total fraud in this relationship. I mean, she knows who's who in the ultra-rich upper class of Maine, while I'm just a poor bartender who's going to community college. If you want to get ahead in this industry, you need to know who's who.
See also: know, who
Farlex Dictionary of Idioms.

know who's who

be aware of the identity and status of each person.
See also: know, who
Farlex Partner Idioms Dictionary
See also:
  • anyone who is anybody
  • along the beaten track
  • beaten
  • be roasted
  • come from far and wide
  • couple
  • couple of
  • a couple of (people or things)
  • big and bold
  • force of numbers