03757138-n
(4)
|
subway, metro, tube, underground, subway system, MRT
| |
an electric railway operating below the surface of the ground (usually in a city) |
01706465-a
(4)
|
secret, clandestine, undercover, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, underground
| |
conducted with or marked by hidden aims or methods |
08360672-n
|
resistance, underground
| |
a secret group organized to overthrow a government or occupation force |
00487018-r
|
underground
| |
in or into hiding or secret operation |
00486917-r
|
underground
| |
beneath the surface of the earth |
02471984-a
(9)
|
underground, belowground
| |
under the level of the ground |