Where does “underchin” come from?

underchin (English) comes from English chin, from Middle English chyn, from Old English ċinn, from Proto-West Germanic kinnu, from Proto-Germanic kinnuz, from Proto-Indo-European ǵénu- — jaw, cheek, chin; cheek.

underchin (English): The underpart of the chin

Definitions

  1. The underpart of the chin

Ancestry of “underchin”, step by step

underchin traces back through two separate lines of ancestry.

via English chin

StepLanguageWordMeaning
1EnglishchinThe bottom of a face, the typically jutting...
2Middle EnglishchynThe chin or jawline; The bone composing the chin;...
3Old Englishċinnchin
4Proto-West Germanickinnuchin, jaw
5Proto-Germanickinnuzcheek; chin, jaw
6Proto-Indo-Europeanǵénu-jaw, cheek, chin; cheek

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European ǵénu-