"Turns dime" is an idiomatic expression meaning to change direction suddenly or unexpectedly. There are several other synonyms that can be used in place of this phrase such as "changes course," "shifts gears," "make a U-turn," "takes a 180-degree turn," "about-face," "makes a sudden turn," or "make a sudden change in direction." All of these phrases suggest a sudden or unexpected change in direction, whether it be physical or metaphorical. It is important to choose the right synonym for the context of the sentence in order to convey the intended meaning accurately.