underground in English: Under the surface of the ground; in Britain, the Underground is the train system under a city. (adjective)

Translation

Under the surface of the ground; in Britain, the Underground is the train system under a city.

Word origin

An English compound of under and ground, describing anything below the surface of the earth.

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Here "underground" means below the surface of the ground.

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As an adjective, "underground" describes things built or living under the ground.

London.

With a capital letter, "the Underground" is the London train system under the city.

ground

The land under your feet when you are outside.

train

A long line of carriages that runs on metal tracks and carries people or goods.

tunnel

A long hole under the ground or through a hill for cars, trains, or people.

deep

Going a long way down from the top, or a long way in from the front.

below

In a lower place than something else.

warren

A group of underground holes and tunnels where rabbits live.

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