double-action

[ duhb-uh l-ak-shuh n ]

/ ˈdʌb əlˈæk ʃən /

(of a firearm) requiring only one pull of the trigger to cock and fire it.

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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.

First recorded in 1850–55

The powerful, double-action pumps quickly ejected the water-ballast.
A Sub and a Submarine|Percy F. Westerman
It was a wall mill equipped with a glass-front metal hopper and employing a ratchet spring-lock nut and double-action grinders.
All About Coffee|William H. Ukers
It was a double-action apparatus, made entirely of bamboo, except the pistons, which were of feathers.
The Philippine Islands|John Foreman
One double-action folding machine will fold fifty sheets in a minute.
The Pictorial Press|Mason Jackson

That is, the hammer would have traveled back all the way, whether it was cocked or fired in a double-action manner.
Warren Commission (3 of 26): Hearings Vol. III (of 15)|The President's Commission on the Assassination of President Kennedy