塞がる

1. Origins, structure, and basic meaning

• Structure: 塞がる is read ふさがる. It is an intransitive verb meaning to become blocked or filled.
• Basic usage: It describes a drain blocked by leaves and a hole in a wall becoming filled with repair material.

2. Common pitfalls and similar expressions

• A blocked drain
  • 排水口が塞がって水が流れない means the water cannot flow because the drain is blocked.
• A hole becoming filled
  • 穴が補修材ですっかり塞がる describes a hole becoming completely filled with repair material.