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  1. To bear in; underholing or undermining; driving in at the top or at the side of a working.
  2. Eng. A calcareous or clay ironstone nodule, Derbyshire. Arkell
  3. The mass of iron, which, as a result of wear of the refractory brickwork or blocks in the hearth bottom of a blast furnace, slowly replaces much of the refractory material in this location. Syn: salamander

Source: Dictionary of Mining, Mineral, and Related Terms

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