turn an honest penny turn an honest penny {v. phr.} To realize a good profit. Tom turned an honest penny in the soybean trading business. Compare: PRETTY PENNY. Categories: add yours {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: T Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Leave my opinion