The term 'Dairy Buy' can be broken down into two crossword solutions: MILK (4 letters) and CHEESEWHEEL (11 letters). MILK is a white liquid produced by mammals such as cows, goats, and sheep. It is a staple in many diets around the world and is used to make a variety of products such as cheese, yogurt, and butter. A cheesewheel is a large round wheel of cheese that is often used as a decorative item or for serving at parties. It is usually made from cow's MILK and can range in size from small to very large.