The definition of a subway is an underground train system, or an underground passage.
A road or path
A naturally occurring underground hollow or passage, especially one with an opening to the surface of the Earth. Caves can form through a variety of processes, including the dissolution of limestone by flowing water, the differential cooling of volcanic magma (which occurs when the outside surface of the lava cools, but the inside continues to flow downwards, forming a hollow tube), or the action of wind and waves along a rocky coast.
An underground or underwater passage.
Find another word for underpasses. In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for underpasses, like: subways, passages, caves, bridges and tunnels.