subway
noun
1. 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'
Similar word(s): metro, tube, underground
Definition categories: man–made, railroad, railway
2. an underground tunnel or passage enabling pedestrians to cross a road or railway
Similar word(s): underpass
Definition categories: man–made, tunnel
verb
1. (intransitive, US, informal) To travel by underground railway.