Lie detector

noun, slang

Definitions

Noun
  1. 1
    A device designed to detect or indicate when a person is lying by measuring and recording several physiological variables. informal

    "It is a lie detector; with its aid one can plumb the bottomless pits of a chap's subconscious mind, and fathom all the mysteries of his subliminal ego."

  2. 2
    a polygraph that records bodily changes sometimes associated with lying wordnet

Etymology

From lie + detector. First use appears c. 1909. See cite below.

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