Opposite side is a term used to refer to the other side of an object, image, or space. The phrase can be substituted with other words in order to provide a more accurate description of the situation. Some synonyms for the term opposite side include "alternate side", "contrary side", and "adverse side". Other possible options could include "flip side", "back side", or "reverse side". These terms can be used in a variety of contexts, including discussing the different sides of a coin, describing the opposite end of a room, or referring to two opposing viewpoints or perspectives.