Doing a U-turn is a maneuver in which a vehicle turns around 180 degrees to go in the opposite direction. It is often used when a driver has gone too far or needs to turn around for another reason. The term 'do a U-turn' can also be used figuratively to mean changing one's opinion or course of action. The crossword solution for this term is 'REVERSE, ' which is an appropriate word to describe the physical act of turning around.