An intransitive verb meaning to occur or happen; used when incidents, accidents, or changes take place.
昨夜、近くで大きな事故が起こった。
A large accident occurred nearby last night.
地震はいつ起こるかわからない。
You never know when an earthquake will occur.
会議中にトラブルが起こり、予定が遅れた。
A problem arose during the meeting and the schedule was delayed.