The crossword solution for the term 'cooler or jug' is STIR. A cooler or jug is a type of container used to store and transport liquids, such as water, juice, or beer. It is often made of plastic or metal and has a handle for easy carrying. The term 'STIR' refers to the act of mixing the contents of the cooler or jug, usually with a spoon or other utensil. This helps to ensure that all of the ingredients are evenly distributed throughout the liquid.