垂すい直ちょく線せん

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).

• この図ず形けいに垂すい直ちょく線せんを引ひいてください。

  Please draw a perpendicular line on this figure.

• 壁かべの垂すい直ちょく線せんが少すこし傾かたむいている。

  The vertical line on the wall is slightly tilted.