adjective. Situated, occurring, or operating below the surface of the earth.

adjective. undefined

adjective. Hidden or concealed; clandestine.

adjective. Of or relating to an organization involved in secret or illegal activity.

adjective. Of or relating to an avant-garde movement or its films, publications, and art, usually privately produced and of special appeal and often concerned with social or artistic experiment.

noun. A clandestine, often nationalist, organization fostering or planning hostile activities against, or the overthrow of, a government in power, such as an occupying military government.

noun. A subway system.

noun. An avant-garde movement or publication.

adverb. Below the surface of the earth.

adverb. In secret; stealthily.

transitive verb. To situate under the ground.

Beneath the surface of the earth: as, to sink underground.

Being below the surface of the ground: as, an underground story or apartment.

noun. That which is beneath the surface of the ground.

To place or lay underground, as an electric wire.

noun. An underground passage.

noun. A contraction of underground railway.

adjective. Being below the surface of the ground.

adjective. Done or occurring out of sight; secret.

adjective. See under Railroad.

adjective. undefined

noun. The place or space beneath the surface of the ground; subterranean space.

noun. a subway or subway system, especially in the United Kingdom.

noun. a secret organization opposed to the prevailing government.

noun. a group or movement holding unorthodox views in an environment where conventional ideas dominate, as in artistic circles.

adverb. Beneath the surface of the earth.

adjective. Below the ground; below the surface of the Earth.

adjective. Hidden, furtive, secretive.

adjective. Of music, art, etc, outside the mainstream.

adverb. Below the ground.

adverb. Secretly.

noun. An underground railway.

noun. A movement or organisation of people who resist political convention.

noun. A movement or organisation of people who resist artistic convention.

verb. To route electricity distribution cables underground

adjective. conducted with or marked by hidden aims or methods

adverb. in or into hiding or secret operation

adverb. beneath the surface of the earth

adjective. under the level of the ground

noun. an electric railway operating below the surface of the ground (usually in a city)

noun. a secret group organized to overthrow a government or occupation force

"The term underground was used as symbolical of the secret manner in which our friends had to work in order to help us."

go underground  underground forest  underground railroad  underground railway  underground water  

covert  subsurface  underground railway  

railroad  railroad line  railway  railway line  railway system  

central  extensive  industrial  inner  nearby  

Amtrak  Charley  L  Paris  Trojan horse