mouth
MOWTH · noun
Origin
English mouth comes from Old English mūþ, from Proto-West Germanic *munþ, from Proto-Germanic *munþaz, ultimately from Proto-Indo-European *ment- meaning 'to chew; jaw, mouth'.
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Journey
The verb 'to mouth' developed later in Middle English, formed directly from the noun.
Related words
It's cognate with German Mund, Dutch mond, and Swedish mun, all meaning 'mouth' — and more distantly with Latin mentum ('chin') and mandō ('to chew'), showing the same root chewing its way into different body parts across languages.