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WordNet-Online
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Adjective underground has 3 senses
- belowground, underground - under the level of the ground; "belowground storage areas"; "underground caverns"
Antonym: overhead (indirect, via surface, subsurface)
Antonym: surface (indirect, via subsurface, overhead)
- clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, on the quiet, secret, surreptitious, undercover, underground - 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"
Antonyms: overt, open (indirect, via covert)
- guerrilla, guerilla, underground, irregular - used of independent armed resistance forces; "guerrilla warfare"; "partisan forces"
Antonyms: nonpartisan, nonpartizan (indirect, via partisan)
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