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noun, Mining, Civil Engineering.
a steel or fiberglass bolt inserted and anchored in a hole drilled in rock to prevent caving of the roof of a tunnel or subterranean chamber.


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  • Rock-bottom

    adjective 1. at the lowest possible limit or level; extremely low: rock-bottom prices. noun 1. the very lowest level: He went bankrupt and touched rock bottom. noun 1. the lowest possible level (as modifier): rock-bottom prices rock bottom The lowest possible level, absolute bottom, as in Wheat prices have reached rock bottom. This idiom alludes […]

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