Definition
to have to start a task or process again because a previous attempt failed.
被迫從頭開始；回到起點。
Due to the dispute over the contract, we are back to square one on the project.
由於合約的爭議，我們在這個專案上又回到了起點。
Our initial plan didn't work out, it looks like we have to go back to square one and rethink everything.
我們的初始計劃沒有成功，看起來我們必須從頭開始，重新思考一切。
After discovering a major flaw in the technology, they had to go back to square one and design the whole system.
在發現技術上的重大缺陷後，他們不得不從頭開始，重新設計整個系統。