Meaning of “mouth-breather” in the English Dictionary

"mouth-breather" in British English

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mouth-breathernoun [ C ]

uk /ˈmaʊθˌbriː.ðər/ us /ˈmaʊθˌbriː.ðɚ/ US informal

(Definition of “mouth-breather” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)