Disaster, Tragedy, Gruesome Event
noun
A disaster occurrence is just a disaster or a tragedy. Look away! 惨事 is a formal word for a tragic or gruesome event — the kind that's so distressing it makes you want to avert your eyes. It emphasizes the horror and emotional pain of the event.
さんじ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
惨事を招くことは避けたい。
I want to avoid causing a disaster.