Underground

English Meaning

The place or space beneath the surface of the ground; subterranean space.

1. Situated, occurring, or operating below the surface of the earth: underground caverns; underground missile sites.
2. Hidden or concealed; clandestine: underground resistance to the tyrant.
3. Of or relating to an organization involved in secret or illegal activity: underground trade in weapons.
4. Of or relating to an avant-garde movement or its films, publications, and art, usually privately produced and of special appeal and often concerned with social or artistic experiment.
5. A clandestine, often nationalist, organization fostering or planning hostile activities against, or the overthrow of, a government in power, such as an occupying military government: "an underground of dissident intellectuals” ( Kenneth L. Woodward).
6. Chiefly British A subway system.
7. An avant-garde movement or publication.
8. Below the surface of the earth.
9. In secret; stealthily.
10. To situate under the ground: workers undergrounding telephone lines.