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

a. start smoking

b. stop smoking

c. try to quit smoking

Idiom of the Day

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Contributor: Matt Errey