To start again from the beginning after something fails.
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To start again from the very beginning after a plan or effort has failed or been rejected.
When you go back to square one, all the progress you made is effectively lost and you have to restart.
It describes frustrating setbacks where nothing was saved from the previous attempt.
"Back to the Drawing Board"
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To redesign or rethink a specific plan that didn't work
"Start From Scratch"
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To begin something entirely new with no prior foundation
"Back to Square One"
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Returning to the very beginning after all progress has been lost