பொருள் : An electric railway operating below the surface of the ground (usually in a city).
எடுத்துக்காட்டு :
In Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'.
ஒத்த சொற்கள் : metro, subway system, tube, underground
பொருள் : An underground tunnel or passage enabling pedestrians to cross a road or railway.
ஒத்த சொற்கள் : underpass