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  1. Recessing or sloping a wall back in successive courses; opposite of corbel. ACSG, 1
  2. A paste of clay or loam. Webster 2nd
  3. The inward slope from bottom to top of the face of a wall. Nichols, 1
  4. A pile driven at an angle to widen the area of support and to resist thrust. Nichols, 1

Source: Dictionary of Mining, Mineral, and Related Terms

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