sweet tooth sweet tooth {n. phr.} A great weakness or predilection for sweets. Sue has such a sweet tooth that she hardly eats anything else but cake. Categories: add yours {n. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: S Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss