To Sew, To Stitch
transitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means sew, so the verb version is to sew or to stitch.
ぬう
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you: You have to sew yourself some clothes because if you don't you'll be completely nude (ぬ). You don't want anyone to see your bits! Sew quickly!
家庭科の授業で、雑巾を縫いました。
We sewed dust cloths in home economics class.