There are several synonyms for the phrase "economic upturn" that can be utilized to convey the same meaning. The most commonly used synonym is "economic recovery," which signifies the improvement of financial conditions after a period of decline. Another suitable term is "economic boom," which suggests a sudden and substantial increase in economic growth. "Expansion" or "upswing" can also be used to refer to a period of economic growth. Other related phrases include "economic expansion," "economic revival," and "economic prosperity." All these synonyms can be used interchangeably based on the context and overall tone of the discussion at hand.