At any time before that, either party can back out.

She was in it now, and could not back out.

He couldn't allow the other man to back out now.

He would, if at all possible, give the rest of the Company the chance to back out.

What would he do if she tried to back out?

You can still back out, a small voice inside him said.

First question Does either of you want to back out?

But I was too far into the matter to back out.

I got us in too deep to back out now.

We are in this too deep already to back out.