a tool for tamping (e.g., for tamping tobacco into a pipe bowl or a charge into a drill hole etc.)
To plug up with clay, earth, dry sand, sod, or other material, as a hole bored in a rock.
The word tamp likely originated as a back-formation from the variant spelling tampin, which was mistakenly thought to be the present participle of tamp. This term is ultimately derived from tampion.