underground

[adv., uhn-der-ground; adj., n., v. uhn-der-ground]
adverb
1.
beneath the surface of the ground: traveling underground by subway.
2.
in concealment or secrecy; not openly: subversion carried on underground.
adjective
3.
existing, situated, operating, or taking place beneath the surface of the ground.
4.
used, or for use, underground.
5.
hidden or secret; not open: underground political activities.
6.
published or produced by political or social radicals or nonconformists: an underground newspaper.
7.
avant-garde; experimental: an underground movie.
8.
critical of or attacking the established society or system: underground opinion.
9.
of or for nonconformists; unusual: an underground vegetarian restaurant.
noun
10.
the place or region beneath the surface of the ground.
11.
an underground space or passage.
12.
a secret organization fighting the established government or occupation forces: He fought in the French underground during the Nazi occupation of France.
13.
(often initial capital letter) a movement or group existing outside the establishment and usually reflecting unorthodox, avant-garde, or radical views.
14.
Chiefly British. a subway system.
verb (used with object)
15.
to place beneath the surface of the ground: to underground utility lines.

Origin:
1565–75; under- + ground1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underground
 
adj
1.  occurring, situated, or used below ground level: an underground tunnel; an underground explosion
2.  secret; hidden: underground activities
 
adv
3.  going below ground level: the tunnel led underground
4.  into hiding or secrecy: the group was driven underground
 
n
5.  a space or region below ground level
6.  a.  a movement dedicated to overthrowing a government or occupation forces, as in the European countries occupied by the German army in World War II
 b.  (as modifier): an underground group
7.  the underground US and Canadian equivalent: subway an electric passenger railway operated in underground tunnels
8.  (usually preceded by the)
 a.  any avant-garde, experimental, or subversive movement in popular art, films, music, etc
 b.  (as modifier): the underground press; underground music

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

underground
1571, "below the surface," from under + ground (n.). Adj. is attested from 1610; fig. sense of "hidden, secret" is attested from 1632; adj. meaning "subculture" is from 1953, from World War II application to resistance movements against German
occupation, on analogy of the dominant culture and Nazis. Noun sense of "underground railway" is from 1887 (phrase underground railway itself is attested from 1834).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Earthquakes may cause the surface to shake but are not a hazard in tunnels deep underground.
From time to time a hollow murmur underground or a sudden spirt of flame into the air tells of what is going on beneath our feet.
They also say it would not end the use of agents but would rather drive the practice underground.
They also argue that a ban would not end the use of agents but would rather drive the practice underground.
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