save somebody's butt
save somebody's ass

They might be the ones to save my ass if things go really wrong.

There wasn't much more he could do now than try to save his own ass.

The short answer is that it might save your ass.

The ability to read people had saved her ass on the street a few times.

Hard as it might be to believe, the Other actually saved my ass.

I saved your ass and you want to be that way?

But this time, it had been the guy in the back who'd saved my ass.

The League won't save your ass if you choose wrong.

"You'll get my boy killed just to save your own ass!"

Waiting for your call so I can go out and save our asses!