The phrase "vertical movement" means the motion or change in position that goes directly up or down, or in a straight line from top to bottom. Full definition
The knob to adjust mirrors operated in a horizontal plane for vertical movement of the mirror, and vice versa. (motoring.com.au)
Ride comfort is largely good but more than expected vertical movement at high speeds and some side - to - side motion at low speeds are part of the experience too. (autocarindia.com)
The soft suspension makes the car have a lot of vertical movement on bad roads while brakes have super sharp bite. (rediff.com)