cub scout . cub scout {n.} A member of the Cub Scouts, the junior branch of the Boy Scouts for boys 8—10 years of age. Jimmie is only seven, too young to be a Cub Scout. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: C Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment