密集

1. Origins, structure, and basic meaning

• Structure: 密集(みっしゅう) means people or things being packed closely together.
• Basic usage: It is used for areas of densely built housing or tightly packed crowds.

2. Common pitfalls and similar expressions

• Spacing compared with 集合
  • 集合(しゅうごう) means gathering in one place. 密集 additionally expresses the close spacing of the gathered people or things.