back to the drawing board
US /bæk tu ðə ˈdrɔɪŋ bɔrd/
UK /bæk tu ðə ˈdrɔɪŋ bɔrd/
1.
to start again on a plan or idea because the previous one has failed
:
•
Our first attempt failed, so it's back to the drawing board.
•
The client rejected the design, so we're back to the drawing board.