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| blowhole |
a vent for air or gases, as from an underground tunnel. [1/3 definitions] |
| bore1 |
to create (an opening such as a tunnel) by cutting through. [1/7 definitions] |
| bulkhead |
a wall built across a tunnel to reinforce it and protect against fire, flood, and the like. [1/3 definitions] |
| burrow |
a hole or tunnel dug by certain animals, such as rabbits, for use as a hiding place or dwelling. [1/5 definitions] |
| catacomb |
(usu. pl.) an underground burial tunnel, lined by recesses for the tombs. [1/2 definitions] |
| excavate |
to form (a hole, tunnel, or the like) by digging out material. [1/5 definitions] |
| gantlet1 |
a portion of railroad tracks made up of two separate but overlapping tracks, usu. constructed at a narrow place, such as a tunnel or bridge. [1/3 definitions] |
| mole3 |
any of various small, insect-eating mammals that have very small eyes, soft light brown to dark gray fur, and strong forefeet, and that usu. tunnel or burrow underground. [1/2 definitions] |
| sandhog |
one who does excavation work in sandy, wet conditions, esp. a laborer working on the construction of an underwater tunnel. |
| subway |
a tunnel used in an underground railway system, or a similar tunnel. [2/3 definitions] |
| tunnel |
to construct a tunnel under or through (a mountain, river, city, or the like). [2/6 definitions] |
| turbojet |
a tunnel-like engine in which air compressed by turbine-driven spinning blades and mixed with atomized fuel is ignited, producing a powerful jet of hot gases that provides thrust and also drives the turbine; turbojet engine. [1/2 definitions] |
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