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cauldron bottom

(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 pron

ˈkɑldɹən ˈbɑtəm84 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 26, 2026

(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.

Origin: From , in reference to the shape and colour as seen from the perspective of someone in the coal mine. Compare in sulfur mining. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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