sub ‧ way /ˈsʌbweɪ/ BrE AmE noun [countable]
[ Word Family: noun : ↑ way , ↑ subway ; adverb : ↑ midway , ↑ way ; adjective : ↑ midway ]
1 . American English a railway system that runs under the ground below a big city SYN underground British English :
the New York City subway
a crowded subway station
Boston has the oldest subway system in the US.
2 . British English a path for people to walk under a road or railway SYN underpass
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THESAURUS
▪ the subway American English the railway system that runs under the ground below a big city. British people use the underground when talking about the railway system in London, and many systems outside the US:
the New York subway
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We got on the next subway train.
▪ the underground British English the railway system that runs under the ground below a big city:
the London underground
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an underground map
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It’s quickest to travel by underground.
▪ the tube British English informal the railway system that runs under London:
We took the tube to Trafalgar Square.
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a crowded tube train
▪ the metro used especially to talk about the railway system that runs under Paris. Also used about some other city's systems, for example Moscow, Washington DC and Newcastle:
the Paris Metro
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Moscow’s metro stations