"subway" in the noun sense
1. metro, tube, underground, subway system, subway
an electric railway operating below the surface of the ground (usually in a city
"in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
2. underpass, subway
an underground tunnel or passage enabling pedestrians to cross a road or railway
Source: WordNet® (An amazing lexical database of English)
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