To suffer harm or misfortune as an innocent bystander, often due to being implicated or involved in someone else's trouble.
邻居家因为装修出了问题，导致我家天花板漏水，真是无妄之灾，成了池鱼之祸。
Our ceiling leaked because of renovation problems in our neighbor's house; it was truly an unprovoked disaster, a calamity for the innocent.
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