塞ぐ

1. Origins, structure, and basic meaning

• Structure: 塞ぐ is read as ふさぐ and can mean “to block” or “to fill”, depending on context.
• Basic usage: The examples show a fallen tree blocking a trail and a board closing a hole.

2. Common pitfalls and similar expressions

• Distinguishing senses and uses
  • It blocks a route or closes an opening; compare the objects in 道を塞ぐ and 穴を塞ぐ.