Today's Business English Idiom

"Know Something Inside Out"

  • What does it mean #1?

    To have a very thorough and complete understanding of something.

  • How do I use it in a sentence?

    "Sarah knows the company's financial system inside out. If you have any questions about it, she's the person to ask."

  • Explanation

    In this example, Sarah has a very deep and detailed understanding of the company's financial system.

  • What does it mean #2?

    To be extremely knowledgeable and familiar with all the details.

  • How do I use it in a sentence?

    "After working on the project for six months, the team knows the client's requirements inside out."

  • Explanation

    Here, the team has a comprehensive understanding of what the client needs because they've spent a lot of time working on the project.