Longman Dictionary of Contemporary English homepage

subway

noun
     
Related topics: Roads, Trains, Railways
sub‧way [countable] American English
1TTT a railway system that runs under the ground below a big city [= underground British English]
the New York City subway
a crowded subway station
Boston has the oldest subway system in the US.
2TTR British English a path for people to walk under a road or railway [= underpass]

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