变故 (biàn gù): Unforeseen event (Noun) — Meaning & Stroke Order

The company encountered an unforeseen event, causing the entire project to be forced to delay delivery.

This mishap was not accidental, but the inevitable result of long-term management negligence.

His life did not completely sink into depression because of that major accident.

Old Zhang, I heard you had a bit of an accident over there. If you need help, just say the word.