subterranean

Words with a similar base: subterranean

'subterranean'

[subterranean.s.01] as in: being or operating under the surface of the earth

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Examples:
subterranean passages
a subsurface flow of water

'subterranean'

[subterranean.s.02] as in: lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); ; - Bertrand Russell

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Examples:
subterranean motives for murder
looked too closely for an ulterior purpose in all knowledge