To make rash or arbitrary judgments about things based solely on partial understanding or limited experience.
他只看了报告的一部分就妄下结论，这简直是盲翁扪钥，根本没有全面了解情况。
He jumped to conclusions after only reviewing a portion of the report, which is akin to a blind person feeling for a key – he simply didn't have a complete grasp of the situation.
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