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The idiom "back to square one" means starting over or returning to the beginning of a project, process, or relationship. It implies that what was previously done has failed or needs to be reevaluated and redone.
The idiom "back to square one" is believed to have originated in the early 20th century. One theory suggests that it comes from the practice of marking a game board or map with a square in order to keep track of progress. When the player reached a point where they needed to start over, they would return to the first square on the board or map. Another theory suggests that the idiom comes from the practice of taking a photograph by manually adjusting the focus and setting. If the photo didn't turn out well, the photographer would have to go back to the beginning and start over. Over time, the idiom has become more commonly used in everyday language to describe any situation where someone needs to start over or return to the beginning of a project, process, or relationship.