The term DINE AT HOME can be broken down into two crossword solutions: SUP (3 letters) and EATIN (5 letters). SUP is an abbreviation for the phrase 'SUPERSEDE, ' which means to take the place of or to replace something. EATIN is an informal way of saying 'eating in, ' which is when someone chooses to eat at home rather than going out to a restaurant. Therefore, the term DINE AT HOME can be interpreted as replacing going out to a restaurant with eating at home.