a U -shaped turn made by a vehicle so as to head in the opposite direction from its original course.

a reversal of policy, tactics, or the like, resembling such a maneuver.

to execute a U-turn

to U-turn into oncoming traffic.

noun

backtracking , change of heart , change of mind , change of plan , eating one’s words , one-eighty , retraction , reversal , sea change , turnaround , u-ey , volte-face