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Idioms and Phrases with whys and wherefores

whys and wherefores

All the underlying causes and reasons, as in She went into the whys and wherefores of the adoption agency's rules and procedures. This idiom today is a redundancy since why and wherefore mean the same thing. Formerly, however, why indicated the reason for something and wherefore how it came to be. [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.