It's an old technique, but I don't see it written about anymore. If an edge is a bit high you can square the edge by shifting the camber to the high side of the board.
Frequently some one would write about it, but I don't hear much about it.

I sharpen my irons pretty flat across, just relieving the edges to prevent plane tracks. I think I will go back to a more pronounced camber. I'm sure Pop Wood wrote about it back in the day.

What say yea?