WordNet 3.0 Copyright © 2006 by Princeton University.
- 1. metro, tube, underground, subway system, subway, railway, railroad, railroad line, railway line, railway system
- usage: 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, tunnel
- usage: an underground tunnel or passage enabling pedestrians to cross a road or railway
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See also: subway (Dictionary)