See Also: underground 1, adjective(dictionary)
underground(2)(dictionary)
underground(1)(dictionary)
Underground Railroad(encyclopedia)
Underground Railroad, the(dictionary)
underground 2, adverb(dictionary)
Underground economy(finance)
underground 3, noun(dictionary)
Underground Economy(money)
Underground Joint - Roulette(gambling)

underground 1, adjective (oh)



below the surface of the earth
::an underground passage
::The car park is underground.
[only before noun] an underground group, organization etc is secret and illegal
::an underground terrorist organization
[only before noun] underground literature, newspapers etc are read by a small number of people, and would seem slightly strange or shocking to most people
::the underground press