Meaning of mouth breather | Babel Free

Definitions

1. A person who routinely inhales and exhales through the mouth, instead of through the nose.
2. A person who is boorish, stupid, or otherwise unattractive.
   derogatory, idiomatic, slang

Examples

“Respirations cannot be recorded by this method, if the subject is a mouth breather (as no air flows by the thermistor in the nose).”

“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.”

CEFR level