GNU Collaborative International Dictionary of English

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1.       
   Tamp , v. t. [imp. & p. p. Tamped ; p. pr. & vb. n. Tamping.] [Cf. F. tamponner to plug or stop. See Tampion.]
   In blasting, to plug up with clay, earth, dry sand, sod, or other material, as a hole bored in a rock, in order to prevent the force of the explosion from being misdirected.
   1913 Webster
   To drive in or down by frequent gentle strokes; as, to tamp earth so as to make a smooth place.
   1913 Webster