double-digging
 n.— «The two have employed a practice called “double-digging,” which involves digging up the top foot of soil, tilling the bottom part of the soil underneath and then replacing and tilling the top foot.» —“Yard Farmers: DeKalb residents growing their own organic food” by Caitlin Mullen Daily Chronicle (Dekalb, Illinois) June 13, 2008. (source: Double-Tongued Dictionary)

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  1. Mark says:

    Double-digging also means a way of turning the top layer of soil under with a shovel. One digs a furrow and turns the dirt from the second furrow over into the first and then turns the third furrow into the the second, and so on.

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