mouth breather

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mouth breather (plural mouth breathers)

  1. A person who routinely inhales and exhales through the mouth, instead of through the nose.
    • 1967, Nancy J. Barron, "A Ride in the Human Centrifuge," American Journal of Nursing, vol. 67, no. 8, p. 1654,
      Respirations cannot be recorded by this method, if the subject is a mouth breather (as no air flows by the thermistor in the nose).
  2. (idiomatic, slang, derogatory) A person who is boorish, stupid, or otherwise unattractive.
    • 2004 March 12, Tim Goodman, “Trinkets are spirit guides in Fox's brilliant 'Wonderfalls'”, in San Francisco Chronicle[1]:
      She's a philosophy major from Brown, now working retail at Niagara Falls, living in a trailer and working for a "mouth breather" of a boss.