The phrase "relate at large" means to discuss something in great detail. Some synonyms for this phrase include "elaborate on," "expound," "go into detail," "dwell on," "delve into," and "discuss extensively." Each of these synonyms emphasizes the idea of thoroughly exploring and explaining a topic. Other possible synonyms include "dissect," "break down," "analyze," "examine," and "expose." These words suggest a more critical or investigative approach to exploring a topic. Overall, there are many different ways to say "relate at large," each with its own nuances and shades of meaning.