The crossword solution for the term EXPLAIN FULLY is ELUCIDATE, which is a verb meaning to make something clear or understandable by giving more details or information. It is often used when someone needs to explain something in more detail than they have already done. ELUCIDATE can also be used to describe the process of providing evidence or proof to support an argument. In either case, the goal is to provide a thorough explanation that leaves no room for doubt or misunderstanding.