Plain English Meaning

A racetrack-shaped flight path used to turn the aircraft around so it ends up heading back the way it came, lined up to fly the next part of the approach.

Full Definition

A flight maneuver shaped like a racetrack oval, used to reverse the aircraft's course so it can intercept and follow the inbound segment of an instrument procedure. It consists of an outbound leg, a turn of approximately 180 degrees, an inbound leg, and a final turn back onto the procedure track. It is published when terrain, airspace, or procedure design makes a standard procedure turn unsuitable.