red eye red eye {adj. phr.} Bloodshot eyes that are strained from too much reading. Poor Tim has a red eye; he must have been studying too late again. Categories: add yours {adj. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: R Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry