draw·ing board drawing boards in AM, use drawing-board1. A drawing board is a large flat board, often fixed to a metal frame so that it looks like a desk, on which you place your paper when you are drawing or designing something
If you say that you will have to go back to the drawing board, you mean that something which you have done has not been successful and that you will have to start again or try another idea
board used as a base for drafting on paper; planning stage of an idea or project