直線

1. Origins, structure, and basic meaning

• Structure: 直線(ちょくせん) means a straight line without a bend.
• Basic usage: It is used for drawing lines with a ruler or connecting two points.

2. Common pitfalls and similar expressions

• The verb for drawing a line
  • 直線を引いた means drew a straight line. 引く(ひく) is also used for drawing lines.
• The means of connecting
  • 直線で結んでください requests that something be connected with a straight line; で marks the means used.