| tunnel | | |
| n. (artifact) | 1. tunnel | a passageway through or under something, usually underground (especially one for trains or cars).; "the tunnel reduced congestion at that intersection" |
| ~ auto, automobile, car, motorcar, machine | a motor vehicle with four wheels; usually propelled by an internal combustion engine.; "he needs a car to get to work" |
| ~ catacomb | an underground tunnel with recesses where bodies were buried (as in ancient Rome). |
| ~ passageway | a passage between rooms or between buildings. |
| ~ railroad tunnel | a tunnel through which the railroad track runs. |
| ~ shaft | a long vertical passage sunk into the earth, as for a mine or tunnel. |
| ~ underpass, subway | an underground tunnel or passage enabling pedestrians to cross a road or railway. |
| n. (object) | 2. burrow, tunnel | a hole made by an animal, usually for shelter. |
| ~ hollow, hole | a depression hollowed out of solid matter. |
| ~ rabbit warren, warren | a series of connected underground tunnels occupied by rabbits. |
| v. (motion) | 3. burrow, tunnel | move through by or as by digging.; "burrow through the forest" |
| ~ cut into, delve, dig, turn over | turn up, loosen, or remove earth.; "Dig we must"; "turn over the soil for aeration" |
| v. (contact) | 4. tunnel | force a way through. |
| ~ penetrate, perforate | pass into or through, often by overcoming resistance.; "The bullet penetrated her chest" |
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