have your back to the wall
have your back to the wallor
have your back against the wall
COMMON If you have your back to the wall or have your back against the wall, you are in a very difficult situation, which will be hard to deal with. The European Union has its back to the wall and must make a difficult decision. The regime really has its back against the wall. We are seeing the beginnings of a revolution. Note: You can also say when your back is to the wall or with your back to the wall. When their backs are to the wall, women fight as hard as men. With my back to the wall, I agreed to the decision.