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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walking beam, walking bus, walking catfish, walking delegate, walking dragline, walking encyclopedia, walking fern, walking fish, walking horse, walking leaf, walking line
The American Heritage® Idioms Dictionary
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