English Dictionary

underground

/ˌʌndəˈɡɹaʊnd/

adj

(not comparable) Below the ground; below the surface of the Earth. / (figuratively) Hidden, furtive, secretive.

The underground tunnel was dark and damp.

意味（1）

(not comparable) Below the ground; below the surface of the Earth.

There is an underground tunnel that takes you across the river.

意味（2）

(figuratively) Hidden, furtive, secretive.

These criminals operate through an underground network.

意味（3）

(Of music, art &c.) Outside the mainstream, especially unofficial and hidden from the authorities.

underground music