churn drill
noun
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. 2024
How to use churn drill in a sentence
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
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