Definition of subway noun from the Oxford Advanced American Dictionary

 

subway

 noun
noun
NAmE//ˈsʌbweɪ//
 
 
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an underground railroad system in a city the New York subway a subway station/train a downtown subway stop to ride/take the subway In Boston the subway is known as the “T”; in Washington DC it's the“Metro.” note at underground
See the Oxford Advanced Learner's Dictionary entry: subway