All I did was ask the store employee to break my 10,000 bill and he suddenly freaked out at me.
I've only seen Fugu get that angry and act violently once.
Viet got drunk and disorderly, but Koichi managed to calm him down.
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.