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Meaning of pump-action

pump-ac•tion

Pronunciation: (pump'ak"shun), [key]
— adj.
  1. (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.