subterranean   (Sound)

The subterranean has 2 Senses.

• subterraneous, subterranean
• being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"
• 地球の表面の下で存在しているまたは動くさま

• subterraneous, subterranean, ulterior
• lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell
• 明らかに見えるものや、公言のの裏にあること（特に背景に隠れているあるいは、故意に隠された）