I almost died, secretly, behind closed doors.

Behind closed doors, I'm a crafty person.

decisions behind closed doors, in our name, without our consent.

It's better to negotiate behind closed doors than it is to be out throwing rocks at one another in the public square.

You can't negotiate in public. People won't make concessions in public. They will do that in private. Like sausage making, you have to do it behind closed doors.

Some doors suit a house better when never opened.