The fear of a slump in the economy is a common concern among individuals. However, there are various synonyms for the phrase "fear of slump" that can be used to describe this worry. One example is the fear of economic downturn, which refers to the possibility of a decline in economic activity. Another synonym is the fear of recession, which is a more specific term that describes a prolonged period of economic decline. Additionally, the fear of stagnation could be used to describe the concern for a lack of growth and development in the economy. Overall, these synonyms highlight the anxiety that individuals may feel about the stability and growth of the economy.