cauldron bottom
The term "cauldron bottom" was used in UK mining slang to describe a specific hazard in coal mines, now considered obsolete.
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Definition
C2Mining
(slang, obsolete)A large, round mass in a coal seam, often a fossilized root or stump, that forms part of the roof of a coal mine passage and is prone to falling without warning.
Example
- Miners were always cautious of the cauldron bottom, as it could fall unexpectedly.
Similar
Terms that have similar or relatively close meanings to "cauldron bottom":