Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

idiot light


Definition of idiot light

  1. :  a colored light on an instrument panel (as of an automobile) designed to give a warning (as of low oil pressure)

Seen and Heard

What made you want to look up idiot light? Please tell us where you read or heard it (including the quote, if possible).