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  1. A sudden escape of gas from coal or associated strata into mine workings. See also: outburst
  2. A large outcrop of ore, commonly of low grade. Nelson
  3. To lift: said of a floor that lifts owing to pressure from gas or strata. Mason
  4. In blasting, a shot that blows part of the unfired explosive out of the hole. See also: blown-out shot
  5. To fire shots. Mason

Source: Dictionary of Mining, Mineral, and Related Terms

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