'staple gun' definitions:

Definition of 'staple gun'

(from WordNet)
noun
A hand-held machine for driving staples home [syn: staple gun, staplegun, tacker]

Definition of 'staple gun'

From: GCIDE
  • staple gun \sta"ple gun`\, n. A device used to drive a heavy staple[8] through multiple objects, so as to fasten them together; it has a spring mechanism which stores force as a lever is pulled by the operator's hand, and the force is released all at once to drive the staple fully into the object to be fastened. [PJC]