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The idiom "cut and dried" means that something is final, settled, or complete. It can also imply that a situation has reached the stage of being no longer open to change or question.
The origin of the idiom "cut and dried" is unclear, but it has been in use since at least the mid-19th century. One theory suggests that it comes from the way farmers would dry their fruit by cutting it into pieces and spreading it out to dry in the sun. Another theory relates the phrase to the way fish were once prepared for cooking by being cut into slices and allowed to dry on a wooden board before being fried.