אונטערמאַנהעטן (Yiddish) comes from Yiddish אונטער, from Old High German untar, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.
Ancestry of “אונטערמאַנהעטן”, step by step
אונטערמאַנהעטן traces back through two separate lines of ancestry.