LekhoriLekhoriBelow the ground; below the surface of the Earth.
There is an underground tunnel that takes you across the river.
Outside the mainstream, especially unofficial and hidden from the authorities.
underground music
To route electricity distribution cables underground.
One is to underground where no other alternative will work, and this method should be used universally in urban regions as it now is in “downtown” sections.
simple past and past participle of undergrind
The London Underground.
Although some of the stations on ' The Branch ' have not, as yet, suffered any considerable structural alterations, all are now equipped with the familiar Underground type name boards, and as a result the imposing titles of G.N. days have been ruthlessly curtailed.
From Middle English undergrounde (adverb), equivalent to under + ground or under- + ground. Compare Dutch ondergrond, ondergronds, German Untergrund, Danish undergrunds.
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Secretly.
A movement or organisation of people who resist political convention.
the French underground during World War II