leading light leading light {n. phr.} A prominent person in a community, company, or group. Alan is the leading light of our discussion group on music. Categories: add yours music {n. phr.} 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 Post my comment