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underground tunnel

underground tunnel

7 3.2
A passage built under the ground for people or vehicles to pass through
  • noun
  • /ˈʌndərˌɡraʊnd ˈtʌnəl/
translation icon : túnel subterráneo
  • It's composed of 17 different buildings, all of which are connected through a series of underground tunnels.
  • network of underground tunnels

He said, Oh, yeah, we, we had guys in in Vietnam that would use those to find underground tunnels, find land mines.

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Examples

  • As far as she knew, there was only one way out of D.B.'s house, the guarded underground tunnel.

    Fiction book (2001)
  • There's a network of underground tunnels.

  • This line is an underground tunnel, an escape route that was never found.

  • What underground tunnels are you talking about?

  • Somewhere, maybe miles away or maybe close by, people were driving their cars through underground tunnels under Boston.

    Fiction book (2001)
  • Movement between the compounds and the mines was generally through underground tunnels.

    Academic text (2001)
  • There's an old underground tunnel leading out of here.

  • There are underground tunnels beneath the frost line to store perishables.

  • An extraordinary network of underground tunnels lined with shops unites downtown Toronto, and apparently one could wander through them forever.

    Academic text (1995)
  • There is an old underground tunnel leading out of here.

Synonyms

tunnel
vsunderground tunnel
615 1.0

An underground passage for cars, trains, or people to travel through

is the general term for built passages beneath the surface for transport or access
subway
vsunderground tunnel
  • UK
54 1.0

An underground passage for people to cross under a road or railway

is broader, applying to many subsurface passages not only pedestrian crossings
underpass
vsunderground tunnel
12 2.7

A tunnel under a road or railway that people use to cross safely

is used for crossing under roads or rails rather than general subsurface access
crawlspace
vsunderground tunnel
  • US
8 6.6

A narrow unfinished space under a building floor used to reach pipes, wires, or vents

is generally a built passage for movement or transport rather than small service space
crawlway
vsunderground tunnel
1 7.9

A narrow passage just large enough for a person to crawl through

is wider in purpose and size, used for transport utilities or access
railroad tunnel
vsunderground tunnel
  • US
1 3.5

A tunnel built for trains to pass through hills or under cities

covers many uses beyond trains including utilities and pedestrian access

How Deep

underground tunnel
7 3.2
underpass
12 2.7
culvert
  • Specialized
9 6.8

Surface Forms

Morphology

underground + tunnel

The meaning 'a passage beneath the surface' is directly and transparently derived from combining 'underground' (below ground) with 'tunnel' (a passage). This straightforward modifier + noun composition follows common English and cross-linguistic patterns, so a B1 learner who knows both constituents will readily understand it.

Etymology

The noun underground tunnel is a simple picture: underground means under the ground and a tunnel is a long passage you can walk or drive through. People dig these passages to move people, trains, pipes, or cables safely 'below the surface', so today underground tunnel means a built passage under the ground used for 'transportation' or access.