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