A reversal of policy; an about-face, a backflip.
A turn in a vehicle carried out by driving in a semicircle in order to travel in the opposite direction.
To shift from one opinion or decision to its opposite.
To turn a vehicle in a semicircle so as to face the opposite direction.
The usage of a runway as a taxiway, especially at private strips and smaller airports.
The act of building all possible solutions to a problem incrementally, abandoning any candidate solution if it cannot lead to a valid solution.
The act of one who, or that which, backtracks; a retracing of one's steps.