That very person or thing, the same as. For example, In the elevator I ran into none other than the woman we'd been talking about, or It turned out to be none other than Jim in a clown costume. [Late 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.