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know your stuff

Meaning: If you know your stuff, you're very good at what you do, and you know a lot about it.

For example:

  • The technician who looks after the computers at our office really knows her stuff. She's great!

  • When it comes to growing vegetables, Uncle Ken sure knows his stuff. He's been growing veggies in his back garden for forty years!

Quick Quiz:

We'll soon know how good he is at fixing cars. If he knows his stuff, the car should
  1. start smoking
  2. stop smoking
  3. try to quit smoking

Discuss: know your stuff

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