/sub"way'/ , n.
1. Also called, esp. Brit., tube, underground . an underground electric railroad, usually in a large city.
2. Chiefly Brit. a short tunnel or underground passageway for pedestrians, automobiles, etc.; underpass.
v.i.
3. to be transported by a subway: We subwayed uptown.
[ 1820-30; SUB- + WAY 1 ]