[puhmp-ak-shuh
n] 
| (of a shotgun or rifle) having an action that extracts the empty case, loads, and cocks the piece by means of a hand-operated lever that slides backward and forward; slide-action. |
| pump action | |
noun | |
| action mechanism in a modern rifle or shotgun; a back and forward motion of a sliding lever ejects the empty shell case and cocks the firearm and loads a new round |