Underground

English Dictionary -> Letter U -> Underground

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Underground Definition

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

Underground Synonyms

• belowground
• clandestine
• cloak-and-dagger
• guerilla(a)
• guerrilla(a)
• hole-and-corner(a)
• hugger-mugger
• hush-hush
• irregular
• metro
• on the quiet(p)
• resistance
• secret
• subway
• surreptitious
• tube
• undercover
• underground