Extended Open Multilingual Wordnet 1.3

地下, 地下+的

subsurface

beneath the surface

秘密, 暗中, 地下

secret, clandestine, undercover, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, underground, hidden

conducted with or marked by hidden aims or methods

地下, 地下+的

subterranean, subterraneous, underground, subterrene

being or operating under the surface of the earth

地下, 地下+的

underground, belowground

under the level of the ground