Defect
Fault, Deficiency, Deformity
noun
If there is a cave in because it was lacking something that means there was a defect or a fault in there somewhere.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
消費者からこの商品の安全性の欠陥が指摘されています。
The safety defect in this product was identified by consumers.