underground
noun
- 1
An underground railway, especially for mass transit of people in urban areas.
- 2
A train that runs on such an underground railway.
- 3
A rapid transit system, regardless of the elevation of its right of way.
- 4
An underground walkway, tunnel for pedestrians (called pedestrian underpass in US).
- 5
An underground route for pipes, sewers, etc.
noun
- 1
Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
- 2
(with definite article) A movement or organisation of people who resist political convention.
“the French underground during World War II”
- 3
(with definite article) A movement or organisation of people who resist artistic convention.
verb
- 1
To route electricity distribution cables underground
adjective
- 1
Below the ground; below the surface of the Earth.
“There is an underground tunnel that takes you across the river.”
- 2
Hidden, furtive, secretive.
“These criminals operate through an underground network.”
- 3
Outside the mainstream, especially unofficial and hidden from the authorities.
“underground music”
Antonyms
adverb
- 1
Below the ground.
“The tunnel goes underground at this point.”
- 2
Secretly.
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