殿下

1. Origins, structure, and basic meaning

• Structure: 殿下 is read でんか and is a title of respect for a high-ranking royal such as a prince or princess.
• Basic usage: It is used when directly addressing or respectfully referring to a royal person.

2. Common pitfalls and similar expressions

• Choosing the English pronoun
  • The Japanese form stays the same, but English uses Your Highness in direct address and His Highness or Her Highness for third-person reference.