1819, "to fill (a hole containing an explosive) with dirt or clay before blasting," a workmen's word, perhaps a back-formation from tampion, that word being mistaken as a prp. (*tamping).
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
Welders shall utilize as tamp to identify their work.
Then he began to tamp at the hole with a three-foot-seven-inch iron bar.
Even the administration seemed anxious to tamp down expectations.
Place concrete around posts in a continuous pour, tamp for consolidation.
He manages to tamp down crowds dying to be electrified.
Never tamp vigorously or continue to tamp after the explosives have filled-out to the walls of the hole.
We collectively have to do something to tamp down the anger.