To Occur
To Happen, To Take Place
intransitive verb, godan verb
おこる
起こる （おこる） To Occur, To Happen, To Take Place
怒る （おこる） To Get Angry, To Get Mad
起こす （おこす） To Wake Someone Up, To Cause Something
起きる （おきる） To Wake Up, To Get Up, To Occur
生じる （しょうじる） To Occur, To Arise, To Cause Something
I would Get Angry 怒る if that Occurred 起こる too.