一筆

1. Origins, structure, and basic meaning

• Structure: 一筆 is read as いっぴつ and means “a brief note” and “a single stroke”.
• Basic usage: It denotes a brief note sent from a trip and the final brushstroke completing a dragon painting.

2. Common pitfalls and similar expressions

• 一筆したためる / 最後の一筆
  • 一筆したためる means writing a brief note, while 最後の一筆 is a literal brushstroke.