mouth: [OE] Mouth is part of a general Germanic family of ‘mouth’-words that go back to a prehistoric *munthaz: its modern relatives include German and Danish mund, Dutch mond, and Swedish mun. The loss of the nasal consonant is part of a general phenomenon that happened in primitive Old English (and also in Old Frisian and Old Saxon) whose effects can be seen also in goose (beside German gans) and tooth (beside German zahn). It is thought that *munthaz itself comes from the same Indo- European source as produced Latin mentum ‘chin’.
mouth (n.)
Old English mut "mouth, opening, door, gate," from Proto-Germanic *munthaz (cognates: Old Saxon, Old Frisian muth, Old Norse munnr, Danish mund, Middle Dutch mont, Dutch mond, Old High German mund, German Mund, Gothic munts "mouth"), with characteristic loss of nasal consonant in Old English (compare tooth, goose), from PIE *mnto-s (cognates: Latin mentum "chin"). In the sense of "outfall of a river" it is attested from late Old English; as the opening of anything with capacity (a bottle, cave, etc.) it is recorded from c. 1200. Mouth-organ attested from 1660s.
mouth (v.)
c. 1300, "to speak," from mouth (n.). Related: Mouthed; mouthing. Old English had mueettan "to blab."
例文
1. A thorough brushing helps to freshen up your mouth .
歯を徹底的に磨くことは、口臭をスッキリさせるのに役立ちます。
2.His mouth was a little open，asif he 'd started to scream.
彼の口はかすかに開き、悲鳴を上げ始めようとしているようだ。
3.I 've always had a loud mouth ，I refuse to be silenced.
私はいつも大きな声で自分の考えを言っています。圧力に迫られて何も言わないことはありません。
4.You wouldn 't be here now if she 'd kept her mouth shut.
彼女が口をつぐんでいれば、あなたは今ここにいないだろう。
5.She flicked a crumb off the corner of her mouth .