(UK, mining, _, slang, obsolete) A large, round mass in a coal seam that forms part of the roof of a coal mine passage (usually being a fossilized root or stump); considered a hazard due to being prone to falling without warning.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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