Longman Dictionary of Contemporary English homepage

underground

1 adjective
     
un‧der‧ground1
1 below the surface of the earth:
an underground passage
The car park is underground.
2 [only before noun] an underground group, organization etc is secret and illegal:
an underground terrorist organization
3 [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

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