The term 'Go Back to the Drawing Board' is a phrase used to indicate that a plan or idea needs to be reworked or reconsidered. This phrase can be broken down into two crossword solutions: REDO (4 letters) and REPLAN (6 letters). REDO means to do something again, while REPLAN means to make a new plan. Therefore, the phrase 'Go Back to the Drawing Board' is an expression that suggests that a plan or idea should be redone or replanned.