drawing board
Pronunciation:
/ˈdʒɹɔɪŋ bɔːd//ˈdʒɹɔɪŋ bɔːɹd/noun
Definitions
A plane surface or table to which paper can be fastened for drawing purposes.
The planning stage of a project.
Example: We'll need to go back to the drawing board to figure out where the project went wrong.