重宝

1. Origins, structure, and basic meaning

• Structure: 重宝 is read as ちょうほう and is a noun and する expression for finding an item highly useful or valuing and using it with care.
• Basic usage: Use ナイフは重宝する when the item proves handy and 辞書を重宝する when a person values the item.

2. Common pitfalls and similar expressions

• Subject and object
  • In the handy sense, the item is the topic; in the treasure sense, the valued item is marked with を.
• How the senses connect
  • Repeated use because something is convenient naturally extends to valuing it and keeping it close at hand.