1. In American and Canadian English, a subway
is a mass transit
system with trains that operate underground; also known as a metro
or rapid transit
system (see also List of metro systems
); also known as the underground
in British English, e.g. London Underground
2. A subway in both the UK and North America is a pedestrian tunnel that goes under a road.
3. Subway is the trade name of a multinational franchising company selling sandwiches and salads.
4. Subway is a french movie by Luc Besson (1985)