穴

1. Origins, structure, and basic meaning

• Structure: 穴 is read as あな and means “hole”.
• Basic usage: It refers to a small hole in a sock and an opening in the garden from which an insect emerges.

2. Common pitfalls and similar expressions

• 穴が開く / 穴から出る
  • Use 穴が開く for a hole forming and 穴から出る when it is the point of emergence.