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Dictionary definition for: Underground

1. (n) a secret group organized to overthrow a government or occupation force

2. (s) under the level of the ground; "belowground storage areas" "underground caverns"

3. (r) in or into hiding or secret operation; "the organization was driven underground"

4. (n) electric underground railway

5. (s) conducted with or marked by hidden aims or methods; "clandestine intelligence operations" "cloak-and-dagger activities behind enemy lines" "hole-and-corner intrigue" "secret missions" "a secret agent" "secret sales of arms" "surreptitious mobilizati

6. (r) beneath the surface of the earth; "water flowing underground"

7. (s) used of independent armed resistance forces; "guerrilla warfare" "partisan forces"

WordNet 2.1 Copyright Princeton University. All rights reserved.