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Yours, Etc.: Origins and Uses of 8 Sign-Offs

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 ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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