split-up . split-up {n.} A separation or division into two or many smaller parts. The split-up of our company was due to the founder's untimely death. Categories: add yours death {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: S Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment