Pronunciation: (
adj., n., v.un'dur-ground"),
1. beneath the surface of the ground: traveling underground by subway.
2. in concealment or secrecy; not openly: subversion carried on underground.

1. existing, situated, operating, or taking place beneath the surface of the ground.
2. used, or for use, underground.
3. hidden or secret; not open: underground political activities.
4. published or produced by political or social radicals or nonconformists: an underground newspaper.
5. avant-garde; experimental: an underground movie.
6. critical of or attacking the established society or system: underground opinion.
7. of or for nonconformists; unusual: an underground vegetarian restaurant.

1. the place or region beneath the surface of the ground.
2. an underground space or passage.
3. a secret organization fighting the established government or occupation forces: He fought in the French underground during the Nazi occupation of France.
4. (often cap.) a movement or group existing outside the establishment and usually reflecting unorthodox, avant-garde, or radical views.
5. Chiefly Brit.a subway system.

to place beneath the surface of the ground: to underground utility lines.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

undergraduateunderground movie
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