1. (noun) metro, tube, underground, subway system, subway
an electric railway operating below the surface of the ground (usually in a city)
Synonyms: resistance, metro, electron tube, underground, subway, thermionic vacuum tube, pipe, tubing, vacuum tube, tube-shaped structure, thermionic valve, underpass, subway system, thermionic tube, tube
2. (noun) underpass, subway
an underground tunnel or passage enabling pedestrians to cross a road or railway
Synonyms: underground, metro, subway system, tube, subway, underpass
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