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Vertical
It means moving at a constant speed ... not speeding up or slowing down ... and in a straight line.
Straight across
vertical; straight up and down; upright; meeting a given line or surface at right angles.
Vertical means straight up and down,aligned with the direction of gravity. Vertically upward means vertical in the up direction. So if you jump directly straight up that is vertically upward; when you land you are travelling vertically downward.