奴隷

1. Origins, structure, and basic meaning

• Structure: 奴隷 (どれい) means a person deprived of freedom under another's ownership or control. The examples use a system compound and a status phrase.
• Basic usage: A history class studies 奴隷制度; a story seeks to rescue 奴隷として売られた人々.

2. Common pitfalls and similar expressions

• Historical institution and people sold under that status
  • Adding 制度 names a social structure; として assigns status to people. Because of its historical gravity, avoid casual figurative extension.