The term 'run fast' can be described in many ways. One way is to use the crossword solutions of 'GAIN', 'GALLOP', 'SPRINT', 'SCURRY', and 'SCAMPER'. To GAIN means to acquire or obtain something, usually through effort. Galloping is a type of running that involves taking long strides with both feet leaving the ground at the same time. Sprinting is a type of running that involves short bursts of speed over a short distance. Scurrying is a type of running that involves taking quick, light steps. Finally, scampering is a type of running that involves taking quick, light steps with the feet close together. All of these words describe different ways of running quickly.