backfill

n.
Material used to refill an excavated area.

tr.v., -filled, -fill·ing, -fills.
To refill (an excavated area) with such material.

An early technique used with XTs and ATs that let DESQview run more programs concurrently. Motherboard chips were disabled and EMS chips were assigned the low memory addresses.

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The replacement of excavated earth into a hole or against a structure.
Example:.

Soil which is replaced in an area that has been excavated previously.

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Soil returned to a planting hole after the plant's roots have been positioned. This can be original soil or soil with amendments.