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walking encyclopedia

A very knowledgeable person, as in Ask Rob—he's a walking encyclopedia of military history. A similar expression, a walking dictionary, was used by George Chapman in his poem “Tears of Peace” (c. 1600).

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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.

Related Words

brain, intellectual, braggart, windbag, wiseacre, smarty-pants, smart-ass, know-it-all, sage, scholar, bibliophile, bookman, savant, belletrist, litterateur, wordsmith