The term 'OPTION ON AN EDIT MENU' can be summarized as a feature that allows users to UNDO their actions. This feature is commonly found in software applications, such as word processors, image editors, and other programs. The crossword solution for this term is 'UNDO, ' which is a four-letter word that describes the ability to reverse an action. This feature is often used to correct mistakes or to go back to a previous version of a document.