- beneath the surface of the ground: traveling underground by subway.
- in concealment or secrecy; not openly: subversion carried on underground.
- existing, situated, operating, or taking place beneath the surface of the ground.
- used, or for use, underground.
- hidden or secret; not open: underground political activities.
- published or produced by political or social radicals or nonconformists: an underground newspaper.
- avant-garde; experimental: an underground movie.
- critical of or attacking the established society or system: underground opinion.
- of or for nonconformists; unusual: an underground vegetarian restaurant.
- the place or region beneath the surface of the ground.
- an underground space or passage.
- a secret organization fighting the established government or occupation forces: He fought in the French underground during the Nazi occupation of France.
- (often initial capital letter) a movement or group existing outside the establishment and usually reflecting unorthodox, avant-garde, or radical views.
- Chiefly British. a subway system.
- to place beneath the surface of the ground: to underground utility lines.
Origin of underground
Examples from the Web for underground
But underground classes have Persians getting with the beat.
Atefeh says the participants in the underground classes she attends are mainly young women.
Unfortunately, the underground tunnels that were used to transport booze and, if necessary, escaping patrons, are off-limits.The Bars That Made America Great
December 28, 2014
They go to Paris, but never leave the underground metro station, where they stalk the metro mall shops.‘Girlhood’: Coming of Age in France’s Projects
November 25, 2014
The song did indeed become an underground hit before hitting the mainstream, reaching No. 15 on the RB singles chart.‘The Prince of Chocolate City’: When Gil Scott-Heron Became A Music Icon
November 15, 2014
A rude ladder was the usual mode of entrance into these underground dwellings.English Villages
P. H. Ditchfield
The five lowest levels were underground and all were labelled "Mineral Industries."City of Endless Night
There, in his underground realm, she reigns all the cold winter months.Classic Myths
Mary Catherine Judd
Life, life, everywhere, and seemingly this underground world was endless.Two Thousand Miles Below
Charles Willard Diffin
The lanes of this underground village were still fast asleep.The Fat and the Thin
- occurring, situated, or used below ground levelan underground tunnel; an underground explosion
- secret; hiddenunderground activities
- going below ground levelthe tunnel led underground
- into hiding or secrecythe group was driven underground
- a space or region below ground level
- a movement dedicated to overthrowing a government or occupation forces, as in the European countries occupied by the German army in World War II
- (as modifier)an underground group
- the underground an electric passenger railway operated in underground tunnelsUS and Canadian equivalent: subway
- (usually preceded by the)
- any avant-garde, experimental, or subversive movement in popular art, films, music, etc
- (as modifier)the underground press; underground music
Word Origin and History for underground
1570s, "below the surface," from under + ground (n.). As an adjective, attested from c.1600; figurative sense of "hidden, secret" is attested from 1630s; adjectival 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 (shortened from phrase underground railway, itself attested from 1834).