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know what's what

Meaning: If you know what's what, you have a lot of experience and you understand things well.

For example:

  • 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?

Quick Quiz:

Alex knows what's what in the world of professional football. He's
  1. just learned how to play
  2. been a fan for several years
  3. played and coached for fifty years

Discuss: know what's what

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