one and the same
Identical, as in Gloria's grandfather had been, at one and the same time, a physician at the court and a general in the army. This expression is an emphatic form of “the same.” [Mid-1800s]
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Words nearby one and the same
Example sentences from the Web for one and the same
Mom and daughter are often referred to as one-and-the-same (as in “They like...”) and work hand in glove together.