Meaning of UNDERGROUND in English

UNDERGROUND

I. | ̷ ̷ ̷ ̷| ̷ ̷ adverb

Etymology: under (II) + ground, n.

1. : beneath the surface of the earth

water flowing underground

burrowing underground

2. : in or into hiding or secret operation

an ideology driven underground develops into a more virulent form — W.O.Douglas

the association soon became subversive and went underground — Harold Ingrams

II. ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ adjective

1. : being, growing, or situated below the surface of the ground

underground cave

underground cellar

underground stream

underground rhizomes

2. : dwelling in an underworld

mythical underground people

3. : used or adapted for use or wear underground : employed or performing duties underground

underground foreman

underground shovel

4. : done or occurring underground especially away from public knowledge : conducted or conveyed by secret or stealthy means

underground revolutionary activity

the underground life of civilized societies — Edward Sapir

III. noun

Etymology: underground (II)

1. : the space or place beneath the surface of the ground : a subterranean space or channel

2. : ground or soil lying beneath the surface or beneath something else

3. : an underground city railway system

the London Underground

4.

a. : a movement or group organized in strict secrecy among citizens in an occupied or totalitarian country for maintaining communications, popular solidarity, and concerted resistive action pending liberation

the underground in Occupied France

b. : a clandestine conspiratorial cell or organization set up for revolutionary or other disruptive purposes especially against a civil order — used with the

the Communist underground in wartime Germany

IV. adjective

1.

a. : existing outside the establishment or mainstream

an underground literary reputation

b. : existing outside the purview of tax collectors or statisticians

the underground economy

2.

a. : produced or published outside the establishment especially by the avant-garde

underground movies

underground newspapers

b. : of or relating to the avant-garde underground

an underground theater

V. noun

: a usually avant-garde group or movement that functions outside the establishment

VI. ¦ ̷ ̷  ̷ ̷ ¦ ̷ ̷ transitive verb

Etymology: underground (I)

: to place underground

undergrounding power lines

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.