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underground
An underground railway, especially for mass transit of people in urban areas.
A train that runs on such an underground railway.
A rapid transit system, regardless of the elevation of its right of way.
Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
(with definite article) A movement or organisation of people who resist political convention.
"the French underground during World War II"
Similar: resistance
(with definite article) A movement or organisation of people who resist artistic convention.
Similar: avant-garde, counterculture
To route electricity distribution cables underground
Below the ground; below the surface of the Earth.
"There is an underground tunnel that takes you across the river."
Similar: hypogean, subterranean
Hidden, furtive, secretive.
"These criminals operate through an underground network."
Outside the mainstream, especially unofficial and hidden from the authorities.
"underground music"
Similar: alternative, unconventional
Below the ground.
"The tunnel goes underground at this point."
Similar: below ground
Secretly.
Similar: clandestinely, in secret, on the quiet
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