cauldron bottom

短语

词形变化

cauldron bottoms 复数 cauldron bottoms

释义与例句

n.
  1. 1.

    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.

    英国 废旧 俚语 商务 采矿
  2. 2.

    Used other than figuratively or idiomatically: see cauldron, bottom.

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.

来源：wiktionary