a portable drill rig using a bit fashioned on a massive steel cylinder that is alternately lifted and dropped to drill a hole in earth and rock.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for churn drill
This is a mechanical method and one form of apparatus employed is of the churn-drill type common throughout oil and coal regions.The Business of Mining|Arthur J. Hoskin