ˈdrawing board BrE AmE noun [countable]
1 . (go) back to the drawing board if you go back to the drawing board, you start again with a completely new plan or idea, after the one you tried before has failed:
The current system just isn’t working – we need to go back to the drawing board and start afresh.
2 . on the drawing board if a plan or product is on the drawing board, it is in the process of being planned or prepared:
Other car manufacturers have similar projects on the drawing board.
3 . a large flat board that artists and ↑ designer s work on