know what's what
This page is about the idiom know what's what
If you know what's what, you have a lot of experience and you understand things well.
- Lou has been in the music business for over thirty years so he really knows what's what.
- Where can we find someone who knows what's what when it comes to doing business in China?
Alex knows what's what in the world of professional football. He's
Contributor: Matt Errey