1. (noun) underground, resistance
a secret group organized to overthrow a government or occupation force
Synonyms: resistance, resistivity, immunity, ohmic resistance, underground, subway, impedance, resistor, electrical resistance, metro, opposition, subway system, electric resistance, tube Antonyms: surface, open, overhead, overt
2. (adj) metro, tube, underground, subway system, subway
an electric railway operating below the surface of the ground (usually in a city)
Synonyms: resistance, metro, electron tube, underground, subway, thermionic vacuum tube, pipe, tubing, vacuum tube, tube-shaped structure, thermionic valve, underpass, subway system, thermionic tube, tube Antonyms: overhead, open, overt, surface
3. (adj) belowground, underground
under the level of the ground
Synonyms: hole-and-corner(a), clandestine, cloak-and-dagger, underground, belowground, hush-hush, undercover, surreptitious, hugger-mugger, secret Antonyms: overt, surface, open, overhead
4. (adverb) clandestine, cloak-and-dagger, hole-and-corner(a), hugger-mugger, hush-hush, secret, surreptitious, undercover, underground
conducted with or marked by hidden aims or methods
Antonyms: overt, surface, open, overhead
5. (adverb) underground
in or into hiding or secret operation
Antonyms: overhead, surface, overt, open
6. (adverb) underground
beneath the surface of the earth
Antonyms: overt, open, overhead, surface
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