Dictionary
1underground
adverb un·der·ground \ˌən-dər-ˈgrau̇nd\
: 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
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First Known Use of UNDERGROUND
14th century
Rhymes with UNDERGROUND
aboveground, Afghan hound, all-around, battleground, been around, belowground, bottom round, breeding ground, bring around, cast around, common ground, decompound, dumping ground, end around, fool around, get around, go around, hang around, horse around, in the round, jerk around, kick around, mess around, middle ground, muscle-bound, Norton Sound, off the ground, on background, on the ground, outward-bound, paperbound, perfect-bound, proving ground, push around, quarter-bound, runaround, screw around, shootaround, sleep around, spiral-bound, staging ground, stand one's ground, steamship round, stick around, stomping ground, surround sound, turnaround, turn around, ultrasound, weather-bound, work-around, wraparound
2underground
noun \ˈən-dər-ˌgrau̇nd\
: 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
See underground defined for English-language learners
First Known Use of UNDERGROUND
1594
Related to UNDERGROUND
- Synonyms
- resistance
Other Geology Terms
3underground
adjective un·der·ground \ˈən-dər-ˌgrau̇nd\
: 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>
See underground defined for English-language learners
First Known Use of UNDERGROUND
1601
Related to UNDERGROUND
- Synonyms
- backstairs, behind-the-scenes, clandestine, covert, furtive, hole-and-corner, hugger-mugger, hush-hush, private, privy, sneak, sneaking, sneaky, stealth, stealthy, surreptitious, undercover, secret, underhand, underhanded
Other Geology Terms
UNDERGROUND Defined for Kids
1underground
adverb un·der·ground \ˌən-dər-ˈgrau̇nd\
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-ˌgrau̇nd\
3underground
adjective un·der·ground \ˈən-dər-ˌgrau̇nd\
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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