underground
underground /ˈʌndɝˌgraʊnd/
adjective
-
()
Under the level of the ground
(
belowground
, underground
)
under the level of the ground
Belowground storage areas
belowground storage areas
Underground caverns
underground caverns
-
Conducted with or marked by hidden aims or methods
(
cloak-and-dagger
, hole-and-corner
, hugger-mugger
, clandestine
, hush-hush
, secret
, surreptitious
, undercover
, underground
)
conducted with or marked by hidden aims or methods
Clandestine intelligence operations
clandestine intelligence operations
Cloak-and-dagger activities behind enemy lines
cloak-and-dagger activities behind enemy lines
Hole-and-corner intrigue
hole-and-corner intrigue
Secret missions
secret missions
A secret agent
a secret agent
Secret sales of arms
secret sales of arms
Surreptitious mobilization of troops
surreptitious mobilization of troops
An undercover investigation
an undercover investigation
Underground resistance
underground resistance
adverb
-
Beneath the surface of the earth
(
underground
)
beneath the surface of the earth
Water flowing underground
water flowing underground
-
In or into hiding or secret operation
(
underground
)
in or into hiding or secret operation
The organization was driven underground
the organization was driven underground
noun
-
[British]
An electric railway operating below the surface of the ground (usually in a city)
(
subway system
[ N. American] , tube
[UK] , underground
[British] , metro
, subway
[ N. American] )
an electric railway operating below the surface of the ground (usually in a city)
In Paris the subway system is called the metro' and in London it is called the tube' or the underground'
in Paris the subway system is called the metro' and in London it is called the tube' or the underground'
-
A secret group organized to overthrow a government or occupation force
(
resistance
, underground
)
a secret group organized to overthrow a government or occupation force