Stirring vigorously is a common cooking technique used to mix ingredients together. It involves using a spoon or other utensil to move the ingredients around in a circular motion, creating a vigorous motion that helps to combine the ingredients. The term 'stir vigorously' can also be used to describe any action that requires a lot of energy and effort. In this case, the crossword solution for the term 'stir vigorously' is BEAT, which is an appropriate word to describe the action.