noun
perpendicular line; vertical line
Refers to a line that is perpendicular to a given line or plane; often used in geometry and technical contexts. In everyday usage, it typically means a vertical line (perpendicular to the horizon).
この図形に垂直線を引いてください。
Please draw a perpendicular line on this figure.
壁の垂直線が少
The vertical line on the wall is slightly tilted.