The crossword solution for the term 'BRISK STEP' is 'TROT', which is a four-letter word. Trotting is a two-beat gait of a horse in which the legs move in diagonal pairs, with the front right and rear left legs moving together, followed by the front left and rear right legs. It is faster than a walk but slower than a canter or gallop. The term 'brisk step' is often used to describe a TROT that is faster than usual.