家臣

1. Origins, structure, and basic meaning

• Structure: 家臣, read かしん, refers to a retainer serving a particular lord or household.
• Basic usage: It describes historical lord–retainer relationships, as when a lord sends an envoy or a retainer protects the lord.

2. Common pitfalls and similar expressions

• Retainer and lord
  • 家臣 is the person who serves, while 主君 is the lord that person serves. They identify different positions within the same relationship.
• Distinguishing a modern subordinate
  • 部下 broadly refers to someone under another person’s direction in an organization. 家臣 evokes historical service to a lord or household and has a different tone from a modern office subordinate.