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English to English noun
| 1 |
an electric railway operating below the surface of the ground (usually in a city) |  | Example: in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'
source: wordnet30
| 2 |
an underground tunnel or passage enabling pedestrians to cross a road or railway | | source: wordnet30
| 3 |
An underground way or gallery; especially, a passage under a street, in which water mains, gas mains, telegraph wires, etc., are conducted. | | source: webster1913
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