Definition of idiot light in English:

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idiot light

noun

North American informal
A warning light that goes on when a fault occurs in a device.
Example sentences
  • The idiot light for Foxtrot Base just turned red; they are surrounded.
  • For providing an easy-to-use ‘security idiot light’ to Linux system administrators and distributions everywhere, Nmap, we salute you.
  • Other than this high-tech version of a car's idiot light, I saw no other symptoms.

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