"Fleshed out" is a term that is often used to describe something that has been expanded or developed in more detail. However, there are several synonyms for this phrase that can provide more variety and depth to writing. For instance, "elaborated on" can be used to describe further explanation or insight into a subject. "Augmented" can be used to connote the addition of new details or ideas to a topic. "Enriched" is used to describe the process of enhancing or improving something through the addition of new information. Overall, these synonyms can be employed to bring more clarity and interest to any piece of writing.