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cold case

noun

: an unsolved criminal investigation (as of a homicide or abduction) that has stopped being actively pursued because of a lack of evidence
The case is pursued diligently by various detectives, but eventually abandoned and filed away among other cold cases. Jonathan Yardley, The Washington Post, 9 Feb. 2014

Word History

First Known Use

1973, in the meaning defined above

Time Traveler
The first known use of cold case was in 1973

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