Definitions from Wiktionary (subway)

▸ noun:  (Canada, US, Scotland, South Africa) An underground railway, especially for mass transit of people in urban areas.
▸ noun:  (Canada, US, Scotland, South Africa) A train that runs on such an underground railway.
▸ noun:  (Canada, US) A rapid transit system, regardless of the elevation of its right of way; a metro system.
▸ noun:  (British) An underground walkway, tunnel for pedestrians (called pedestrian underpass in US).
▸ noun:  An underground route for pipes, sewers, etc.
▸ noun:  An underground route for creatures (e.g. bats).
▸ verb:  (intransitive, US, informal) To travel by underground railway.
▸ Also see subway

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