地雷

1. Origins, structure, and basic meaning

• Structure: Written 地雷 and read じらい, it means a buried explosive mine and colloquially a dangerously sensitive topic.
• Basic usage: It is used for battlefield warnings and subjects best avoided with someone.

2. Common pitfalls and similar expressions

• The figurative sense is informal
  • In conversation it signals an emotional minefield rather than an actual weapon.