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underground
Underground tunnels are used for transportation.
underground passage, tunnel
The underground passage connects the two buildings.
plural of souterrain
The underground passages are dark and mysterious.
feminine singular of souterrain
This underground gallery is fascinating.
feminine plural of souterrain
The underground galleries are fascinating to explore.
subterraneously
He advanced subterraneously in the dark tunnels.
(economics) underground economy, shadow economy
The underground economy represents a significant part of economic activity in many countries.
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