John Doe John Doe {n.} A name used for an unknown person, especially in police and law business. The alarm went out for a John Doe who stole the diamonds from the store. Categories: add yours business {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: J Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry