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underground

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