Crush
Chandler's Encyclopedia · 1898 · p. 23
In coal-mining, sinking of the roof, caused by weak ne of the supporting pillars.
Bu kavram başka kaynaklarda da geçiyor
A Vocabulary of Criminal Slang (1915)
The Slang Dictionary Etymological Historical and Anecdotal (1913)
Chamber's Twientieth Century Dictionary (1908)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
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