The term 'BE BASED ON' can be broken down into two crossword solutions: REST (4 letters) and DEPEND (6 letters). REST is a verb meaning to take a break from activity or work, while DEPEND is a verb meaning to rely on someone or something for support. Together, the phrase 'BE BASED ON' implies that something is founded upon or relies upon something else for support. This phrase is often used to describe the relationship between two entities, such as a business and its customers, or a student and their teacher.