話題

1. Origins, structure, and basic meaning

• Structure: 話題 (わだい) is subject matter for conversation or coverage. 話題になる means becoming a topic; 話題を出す means introducing one.
• Basic usage: A new film naturally becomes lunchtime conversation; someone deliberately brings up another topic after a pause.

2. Common pitfalls and similar expressions

• Topic emerging among people and subject deliberately introduced
  • The film enters topic status with に; in the second a person presents a topic as object. Unlike 問題, it does not inherently mean a problem to solve.