adj.1.located, happening, or operating beneath the surface of the earth
2.concealed and done in secret
3.separate from a prevailing social or artistic environment, and often exercising a subversive influence
4.of the secret organization
1.located, happening, or operating beneath the surface of the earth
2.concealed and done in secret
3.separate from a prevailing social or artistic environment, and often exercising a subversive influence
4.of the secret organization
n.1.a railway system that runs below ground, mainly used in British English
2.a secret movement that aims to overthrow a government or fight against an occupying enemy
3.a movement or group that is separate from the prevailing social or artistic environment and often exerts a subversive influence
4.a subterranean space or channel
1.a railway system that runs below ground, mainly used in British English
2.a secret movement that aims to overthrow a government or fight against an occupying enemy
3.a movement or group that is separate from the prevailing social or artistic environment and often exerts a subversive influence
4.a subterranean space or channel
adv.1.below the surface of the ground
2.in secret or in hiding
