Online English Dictionary and Vocabulary Builder
1. [s] 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
2. [s] being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"
1. [a] covert
2. [a] subsurface
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