筆

1. Origins, structure, and basic meaning

• Structure: 筆, read ふで, denotes a brush used to hold ink or pigment for writing or painting.
• Basic usage: It names the tool loaded with ink for writing and cleaned with water after use.

2. Common pitfalls and similar expressions

• Ink brush versus general brush
  • Both examples concern a brush used with ink for writing, so they do not establish the same use for a paintbrush.