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subterranean
01
existing, operating, or happening in secrecy or obscurity
Examples
Rumors of a subterranean organization controlling the city's politics spread like wildfire.
The journalist risked everything to expose the subterranean dealings of the powerful corporation.
02
situated, occurring, or existing beneath the surface of the earth
Examples
The subterranean tunnels were used for secret military operations during the war.
The subterranean river flows silently beneath the ground.
