Writing Brush
Paintbrush, Brush
noun
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you to remember: For as long as you can remember, your family and another family has had a bloody feud (ふで) over this one writing brush. Just think of all the people killed over this brush. This feud has to end.
来週までに絵の具と筆を用意しておいてください。
Please prepare your paints and paintbrushes by next week.
習字の筆は、持ち方も使い方も分かりません。
I don't know how to hold or use a calligraphy brush.
筆マークのアイコンの上にカーソルを合わせて、マウスの左のボタンをカチカチッと２回クリックしてください。
Put the cursor over the brush icon and click the left mouse button twice.