Dictionary![]() ![]() big' dad'dy(often caps.) Informal. 1. a man regarded as the paternalistic head of a family. 2. the founder or a leading member of a company, organization, movement, etc.: the big daddy of soil conservation. 3. the federal government: to thank big daddy for the tax cut. 4. Chiefly Southern U.S.grandfather. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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