cauldron bottom
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
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.
Register: slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “cauldron bottom” mean?
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.
Is “cauldron bottom” formal or informal?
cauldron bottom is generally slang.