Back to the drawing board:
Back to the beginning of a process to start it again, because it is not working.
“Back to the drawing board” 的意思是 “正在进行中的项目或采用的计划失败了，要重新开始、从头再来，才能让事情成功”。
例句
I’m sorry, but this idea just won’t work. We need to go back to the drawing board.
不好意思，这个主意行不通。我们得重新开始。
After several non-starts, we took the project back to the drawing board and now, it works!
几次启动失败后，我们从头开始调整了这个项目，现在进行得很顺利！
The board of directors need to go back to the drawing board and rethink their strategy in improving their marketing campaign.
董事会需要从头开始制定计划，重新思考改进营销活动的策略。
