押印

1. Origins, structure, and basic meaning

• Structure: 押印, read おういん, denotes affixing a seal or stamp to a document.
• Basic usage: In 内容を確認した後、契約書に押印した。, a seal was affixed to the contract after its contents were checked.

2. Common pitfalls and similar expressions

• An action, not an object
  • 押印した means that a seal was affixed: it names the action, not the seal itself.