smell up smell up {v.}, {informal} To make a bad smell. A skunk smelled up our yard last night. Mr. Brodsky's cigar smelled up the living room. Categories: add yours {informal} {v.} 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