The term "over-pass" has numerous antonyms. Some of the common antonyms for the word "over-pass" include "underpass," "underbridge," "low bridge," "subway," and "tunnel." These words denote the opposite of an overpass or a bridge that passes over another object or structure. They refer to a structure that passes beneath a road or a bridge. While an overpass is used to allow vehicles or people to move over a crossroad or railway line, these antonyms are used to allow access under them. Both overpasses and their antonyms are critical structures that play an essential role in transportation and movement of people and goods in different parts of the world.