Zickzackkurs — a zigzag course. It is said of a policy that keeps changing direction.
Hü und hott — the calls of a carter telling his horses to go one way and then the other. It describes contradictory instructions.
Kehrtwende — an about-turn.
Wendehals — the wryneck, a bird that can turn its head far around. It is an old insult for a turncoat. In 1989, demonstrators in East Germany used it against Egon Krenz. On 18 October 1989, Krenz had announced that the party would bring about a Wende, a turn.
Kurs halten — to hold course. It is said in praise.
durchziehen — to pull through, to see a plan through to the end.
nachsteuern, nachjustieren — to steer again, to readjust. These are the approved words for a correction that keeps the course.