noun (common) (futsuumeishi), nouns which may take the genitive case particle 'no'
1. underground; below the groundnoun (common) (futsuumeishi)
2. world of the dead; the gravenouns which may take the genitive case particle 'no', noun (common) (futsuumeishi)
3. underground (activities, movement, etc.); secret; illegal; in hiding