The term BASE ON can be broken down into three crossword solutions: TAGUP (5 letters), BALLS (5 letters), and PREDICATE (9 letters). TAGUP is a term used in the software industry to describe the process of tagging up code with comments to make it easier to read. BALLS is a slang term for courage or bravery, often used to describe someone who is willing to take risks. PREDICATE is a term used in grammar and linguistics to describe a verb phrase that expresses an action or state of being.