Where does “onderkin” come from?

onderkin (Dutch) comes from Dutch onder, from Middle Dutch onder, from Old Dutch under, from Old Saxon undar, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

onderkin (Dutch): double chin

Definitions

double chin

Ancestry of “onderkin”, step by step

onderkin traces back through two separate lines of ancestry.

via Dutch onder

Step	Language	Word	Meaning
1	Dutch	onder	under, downwards; under; under, below, beneath,...
2	Middle Dutch	onder	—
3	Old Dutch	under	under
4	Old Saxon	undar	under
5	Proto-Germanic	under	among, between; under, beneath; under
6	Proto-Indo-European	h₁entér	between
7	Proto-Indo-European	h₁en	in; in, inside

via Dutch kin

Step	Language	Word	Meaning
1	Dutch	kin	chin
2	Middle Dutch	kinne	chin
3	Old Dutch	kinni	—
4	Proto-West Germanic	kinnu	chin, jaw
5	Proto-Germanic	kinnuz	cheek; chin, jaw
6	Proto-Indo-European	ǵénu-	jaw, cheek, chin; cheek

Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →