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

Source: Dictionary of Mining, Mineral, and Related Terms