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opposite number, one's

One's counterpart, as in He's my opposite number in the California office. This expression is generally used for a person's equivalent in another organization or system (number alluding to their position in a hierarchy). [c. 1900]

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