柱

1. Origins, structure, and basic meaning

• Structure: 柱 is read はしら and means a pillar or upright supporting post.
• Basic usage: It is used for replacing a damaged pillar and tying decorations to entrance pillars.

2. Common pitfalls and similar expressions

• Replacing a pillar
  • 柱を新しい木材に替えた describes replacing a damaged pillar with new timber.
• Counting pillars
  • 二本の柱 refers to two upright pillars.