underground : | |||||||||||||
a secret group organized to overthrow a government or occupation force beneath the surface of the earth; "water flowing underground" in or into hiding or secret operation; "the organization was driven underground" under the level of the ground; "belowground storage areas"; "underground caverns" subsurface used of independent armed resistance forces; "guerrilla warfare"; "partisan forces" partisan electric underground railway 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 covert |
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