single-action

[ sing-guh l-ak-shuh n ]

/ ˈsɪŋ gəlˈæk ʃən /

(of a firearm) requiring the cocking of the hammer before firing each shot: a single-action revolver.

Origin of single-action

First recorded in 1850–55

We're not talking hunting rifles here at all, or single-action handguns.

Obama's Guns Task Force |Michael Tomasky |December 19, 2012 |DAILY BEAST
Keeled under-cars for planes: single-action detaching-gear, turning car into boat with one motion of the wrist.

With The Night Mail |Rudyard Kipling
When you pull back and it is in the notch, that is known as single-action firing.

Warren Commission (3 of 26): Hearings Vol. III (of 15) |The President's Commission on the Assassination of President Kennedy
It is taken for granted in the above discussion, and also in the following, that the fly-caster uses a single-action reel.

Fishing with Floating Flies |Samuel G. Camp

On the contrary, single-action reels are made of rather numerous materials and certainly in varying degrees of desirability.

Fishing with Floating Flies |Samuel G. Camp
The reel should be a single-action click reel, the lighter the better, if well made.

Favorite Fish and Fishing |James Alexander Henshall

single-action

(modifier) (of a firearm) requiring the hammer to be cocked by hand before firing