Dictionary

1underground

adverb un·der·ground \ˌən-dər-ˈgrand\

: below the surface of the earth

: in or into a place that is hidden or secret : out of the view of the public

Full Definition of UNDERGROUND

1
:  beneath the surface of the earth
2
:  in or into hiding or secret operation

Examples of UNDERGROUND

  1. They had been living underground as fugitives.

First Known Use of UNDERGROUND

14th century

2underground

noun \ˈən-dər-ˌgrand\

: a system of trains that run below the ground in a large city

the underground : a group of people who secretly work to oppose or overthrow a government

Full Definition of UNDERGROUND

1
:  a subterranean space or channel
2
:  an underground city railway system
3
a :  a movement or group organized in strict secrecy among citizens especially in an occupied country for maintaining communications, popular solidarity, and concerted resistive action pending liberation
b :  a clandestine conspiratorial organization set up for revolutionary or other disruptive purposes especially against a civil order
c :  an unofficial, unsanctioned, or illegal but informal movement or group; especially :  a usually avant-garde group or movement that functions outside the establishment

Examples of UNDERGROUND

  1. I've ridden on the New York subway, the Paris Metro, and the London Underground.
  2. <joined the underground while still a teenager>

First Known Use of UNDERGROUND

1594

Related to UNDERGROUND

Other Geology Terms

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale

3underground

adjective un·der·ground \ˈən-dər-ˌgrand\

: located or occurring below the surface of the earth

: secret and usually illegal

: of, relating to, or produced in a social and artistic world that is different and separate from the main part of society

Full Definition of UNDERGROUND

1
:  being, growing, operating, or situated below the surface of the ground
2
:  conducted by secret means
3
a :  existing outside the establishment <an underground literary reputation>
b :  existing outside the purview of tax collectors or statisticians <the underground economy>
4
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 moviemaker> <an underground theater>

Examples of UNDERGROUND

  1. The drugs are supplied through an underground network.
  2. She loves the city's underground music scene.

First Known Use of UNDERGROUND

1601

Other Geology Terms

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale
UNDERGROUND Defined for Kids

1underground

adverb un·der·ground \ˌən-dər-ˈgrand\

Definition of UNDERGROUND for Kids

1
:  below the surface of the earth
2
:  in or into hiding or secret operation <The rebels went underground.>

2underground

noun un·der·ground \ˈən-dər-ˌgrand\

Definition of UNDERGROUND for Kids

1
:  subway
2
:  a secret political movement or group

3underground

adjective un·der·ground \ˈən-dər-ˌgrand\

Definition of UNDERGROUND for Kids

1
:  located under the surface of the ground <underground pipes>
2
:  done or happening secretly <an underground revolt>

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