(idiom) To investigate a matter indirectly by examining several related elements. It describes uncovering the truth through comparison and cross-checking.
(idiom) One person starts an accusation or rumor, and many others repeat it without checking. It describes the collective spread of an unfounded opinion.
(idiom) To examine reality according to a stated name or function and require the name to match the facts. It also refers to checking titles against actual results.
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