The term EXPLAIN IN DETAIL can be broken down into four crossword solutions: EXPOUND (7 letters), DELINEATE (9 letters), SPELLO (6 letters), and SPELLOUT (8 letters). EXPOUND means to explain something in detail, often using a lot of words. DELINEATE means to describe something in detail, often using diagrams or drawings. SPELLO is a combination of the words 'SPELL' and 'OUT, ' meaning to explain something in detail by spelling OUT each word. SPELLOUT is similar to SPELLO, but it implies that the explanation is more thorough. All four terms refer to providing a detailed explanation of something.