save somebody's butt
save somebody's ass

You've saved my butt so many times I've lost count.

But there were many times when Catholicism saved my butt.

If I run into trouble you can come on out and save my butt.

I'm willing to bet he'll do any thing to save his butt.

The china was my reward for saving his butt; anything more would be far too intimate.

It was the man Thomas wanted to save his daughter's butt.

Your first day on the job, and you sure as hell saved my butt.

I start from this minute figuring out a way to save my butt if the matter comes up.

Dead, and simply to save some bastard's butt higher up the levels.

All I did was dive out of the way to save my butt.