cauldron bottom (English, noun)
expansion: cauldron bottom (plural cauldron bottoms)
Senses:
topics: business
mining
glosses: 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.
tags: UK
obsolete
slang
glosses: Used other than figuratively or idiomatically: see cauldron, bottom.
Forms:
form: cauldron bottoms
tags: plural