Dictionary
pump-ac•tion
Pronunciation: (pump'ak"shun), [key]—
adj.
(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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.