Flowing back is a term used in various contexts to express the act of something reversing its direction and moving backward. However, there are several synonyms that can be used in place of the term "flowing back." Such synonyms include reflux, regurgitation, receding, rebounding, reverting, and retrogressing. Reflux is often used in medical contexts to describe the backflow of fluids in the body, while regurgitation is used to describe the act of food coming back up from the stomach. Receding and rebounding are commonly used to describe the withdrawal of water or waves, and reverting and retrogressing refer to returning to a previous state or manner.