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UNDERGROUND

Definition:

[adverb] in or into hiding or secret operation; "the organization was driven underground"
[adverb] beneath the surface of the earth; "water flowing underground"
[noun] a secret group organized to overthrow a government or occupation force
Synonyms: resistance
[noun] electric underground railway
Synonyms: metro, subway, tube
[adjective] under the level of the ground; "belowground storage areas"; "underground caverns"
Synonyms: belowground
[adjective] 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 mobilization of troops"; "an undercover investigation"; "underground resistance"
Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, on the quiet, secret, surreptitious, undercover
[adjective] used of independent armed resistance forces; "guerrilla warfare"; "partisan forces"
Synonyms: guerrilla, guerilla, irregular