Plain English Meaning
A piece of an airway that bends at a fix instead of running straight. The point where you switch from tuning one navaid to the next is at the bend itself.
Full Definition
An airway or route segment that requires a course change at a fix, producing a bent rather than straight path between two navigation aids. On a dogleg segment, the changeover point is normally located at the fix where the course change occurs, rather than at the midpoint between the two navaids.
Context Anchor
Seen on IFR enroute charts and in changeover point explanations, especially when an airway or route bends between navigation stations.