The term "180-degree" often refers to a rotation or change in direction that is half of a full circle. In geometry, a 180-degree angle is formed when two lines meet to create a straight line, effectively pointing in opposite directions. This concept is commonly used in various fields, including physics and engineering, to describe movements or shifts. In everyday language, a "180-degree turn" can describe a significant change in opinion or behavior. For example, if someone changes their stance on a political issue, it might be said they made a 180-degree turn. This phrase emphasizes the contrast between the previous and current positions.