防壁

1. Origins, structure, and basic meaning

• Structure: 防壁 is read as ぼうへき and means a defensive wall or barrier against an outside threat.
• Basic usage: It can refer to a stone wall protecting a castle or a barrier reinforced in preparation for flooding.

2. Common pitfalls and similar expressions

• Protecting a castle
  • 石の防壁 is the high stone defensive wall built around the castle. Example: 城の周囲には高い石の防壁が築かれていた。
• Reinforcing flood protection
  • 防壁の一部を補強する means strengthening part of the barrier before a flood. Example: 防壁の一部を補強して洪水に備えた。