Gallop meaning : The fastest gait of a horse, a two-beat stride during which all four legs are off the ground simultaneously. An abnormal rhythm of the heart, made up of three or four sounds, like a horse's gallop. (of a horse, etc) To run at a gallop. To ride at a galloping pace. To cause to gallop. To make electrical or other utility lines sway and/or move up and down violently, usually due to a combination of high winds and ice accrual on the lines. To run very fast. To go rapidly or carelessly, as in making a hasty examination. (of an infection, especially pneumonia) To progress rapidly through the body.