To Act Violently
To Rage
intransitive verb, ichidan 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 violence. "To violence" doesn't sound great, so instead this word is to act violently or to rage.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You're about to rage all over the place. You're going nuts. You're going to act violently. Then, a calm wizard steps in front of you and mutters "abara kadabara," (あば) causing you to calm down immediately.
その先生は、暴れる子をなんとか落ち着かせました。
That teacher somehow managed to calm down the unruly child.
あそこにナイフを持って暴れる危険人物がいるので、気をつけてください。
Be careful, there is a dangerous man with a knife rampaging over there.
その店員に、一万円札を細かくしてくれるようたのんだら、急に暴れ出したんだよ。
All I did was ask the store employee to break my 10,000 yen bill and he suddenly freaked out at me.