double-action

剑桥词典

having two different purposes
有雙重作用的
This double-action lotion soothes your skin and enriches your tan . 這種具有雙重功傚的塗劑既能呵護皮膚還能加深曬成的棕褐色。

used to refer to a gun that needs one action for preparing to shoot it and one action for shooting it
（手槍等）聯動式擊發的 返回 double-action