once for all

Second, it'll likely end NorCal fire season once & for all.

“Once for all. If you don’t know that your Bill’s in good hands, I know it. And if you come here bothering about your Bill, I’ll make an example of both your Bill and you, and let him slip through my fingers. Have you paid Wemmick?”

“Well, then, understand once for all that I never shall or can be comfortable—or anything but miserable—there, Biddy!—unless I can lead a very different sort of life from the life I lead now.”

“Tell me once for all, are you engaged to him?”

Borrell says “the situation in the Gaza Strip has long been unsustainable. Only a political solution will bring sustainable peace and end once for all the Palestinian-Israeli conflict.”