cast out . cast out {v.}, {formal} To force (someone) to go out or away; banish; expel. After the scandal, he was cast out of the best society. Compare: CAST OFF (3). Categories: add yours {formal} {v.} 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 Discuss