speed trap speed trap {n.} A place where police hide and wait to catch drivers who are going even a little faster than the speed limit. Mr. Jones was caught in a speed trap. Categories: add yours {n.} 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 Comment on this entry