The term SAT IN A CASK is a phrase used to describe the process of aging alcoholic beverages. The word AGED is a four-letter solution to this crossword puzzle, and it refers to the process of storing alcoholic beverages in wooden casks or barrels for a period of time in order to improve their flavor and aroma. This process is also known as barrel aging, and it is a common practice in the production of whiskey, wine, and other spirits.