back and edge

Fully; wholeheartedly. This phrase refers to both the edge and broad sides of a sword. I'm working on this project back and edge, and I think you will be very impressed with the result. Once Ken found out that he was on the verge of failing that class, he started tackling his homework back and edge. Are you sure you want to lead this committee? It's the sort of thing you'd need to devote yourself to back and edge.