landslide landslide {n.} An overwhelming victory during a political election. Ronald Reagan won the election of 1980 in a landslide. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: L Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry