cauldron bottom
名词 n.
英文释义
名词 n.
- 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.
- Used other than figuratively or idiomatically: see cauldron, bottom.
词形变化
词源
From cauldron + bottom, in reference to the shape and colour as seen from the perspective of someone in the coal mine. Compare Sicilian campanaru (literally “bell tower”) in sulfur mining.
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数据来源: Wiktionary