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In a single-action revolver, the hammer is manually cocked. This advances the cylinder to the next round and locks the cylinder in place. The trigger, when pulled, only releases the hammer, which fires the round.

To fire again, the hammer must be manually cocked again. This is called "single-action" because the trigger only performs a single action, of releasing the hammer. Famous examples of a single-action revolver are the Colt Walker, the Colt Dragoon and the Colt Single Action Army.
https://en.wikipedia.org/wiki/Revolver

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Footnote: This is the video that was used to explain the Alec Baldwin incident on Access Hollywood by NBC.

If you like good educational videos about firearms and how they work, there are some great youtubers to which we want to say thanks for their great videos over the years: hickok45, Forgotten Weapons, Military Arms Channel, Sootch, Lucky Gunner, DemolitionRanch, Matt Rittmann, 45Snipers.