To Make Noise
To Be Boisterous, To Make A Fuss
intransitive verb, godan verb
The kanji is boisterous. The verb version is to make noise or to be boisterous. Basically, you're being boisterous when you make a lot of noise, so that's where it comes from.
You're always going to make noise and be boisterous when you eat something sour (さわ). Imagine stuffing lemon slices, sour candy, and umeboshi into your mouth. All at once. See how much noise you make? They're so sour, and they make you so boisterous.
病院では静かにしてください。騒ぐと他の人に迷惑です。
Please be quiet in the hospital. Making noise is an annoyance to others.
子どもが騒ぐのを止めさせるために、スマホでYouTubeを観せました。
To get my child to stop making noise, I had them watch YouTube on a smartphone.
深夜に騒ぐ人がいて、警察が呼ばれました。
Someone was being noisy late at night, and the police were called.
騒ぐな！死にたいのか？死にたくなけりゃ黙ってろ。
Don't make so much noise! Do you wanna be killed? If not, just shut up.