get it . get it or something in or into one's head {v. phr.} To become possessed of an idea; develop a fixed idea. Jack got it into his head to become a marine and nothing we could say would make him change his mind. Categories: add yours {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: G Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry