[ noun ]
■ an electric railway operating below the surface of the ground (usually in a city)
e.g.)
・in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'
→
metro
,
subway
,
subway system
,
tube
[ noun ]
■ a secret group organized to overthrow a government or occupation force
→
resistance
[ adjective satellite ]
■ conducted with or marked by hidden aims or methods
e.g.)
・underground resistance
→
clandestine
,
cloak-and-dagger
,
hole-and-corner
,
hugger-mugger
,
hush-hush
,
secret
,
surreptitious
,
undercover
[ adjective satellite ]
■ under the level of the ground
e.g.)
・underground caverns
→
belowground
[ adverb ]
■ beneath the surface of the earth
e.g.)
・water flowing underground
[ adverb ]
■ in or into hiding or secret operation
e.g.)
・the organization was driven underground
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