The term 'TURN RAPIDLY' can be summarized by the crossword solution 'SPIN, ' which is a four-letter word. To SPIN means to rotate quickly around an axis, often in a circular motion. It is a common movement used in many activities such as dancing, sports, and even some forms of exercise. Spinning can also refer to the act of changing direction quickly, such as when a car turns sharply. In general, spinning is a fast and dynamic movement that can be used to describe a variety of actions.