The phrase "doeth a u-turn" can be replaced by other synonyms that convey the same meaning. For instance, "turns around" is a simplistic alternative that's commonly used. Additionally, "makes a 180-degree turn" conveys the degree of the turn involved. Other similar phrases include "executes a u-turn" or "performs a turnabout." Synonyms such as "reverses course" or "retreats" suggest a deliberate change of direction. "Backtracks" and "switches lanes," on the other hand, are more neutral in tone and highlight the directional change without emphasizing the u-turn maneuver. Ultimately, the choice of synonym depends on the context in which it's used and the desired emphasis that the writer or speaker intends to convey.