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Featured Word B1

underground (noun / adjective / adverb)

Situated, occurring, or operating below the surface of the earth. It can also refer to a secret or illegal group or movement, or specifically to the rapid transit railway system in London.

💬 Example

"The mole dug a tunnel underground."

💡 Memory Tip

Think of 'UNDER' the 'GROUND'. It's exactly what it says! If you are under the ground, you are underground.

🏛️ Origin

⚠️ Common Mistakes

I'm going to the underground. → I'm taking the underground.

The roots are in underground. → The roots are underground.

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