underlock (English) comes from English under, from Middle English under, from Old English under, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.
underlock (English): A lock of wool hanging under the belly of a sheep
Definitions
A lock of wool hanging under the belly of a sheep
Ancestry of “underlock”, step by step
underlock traces back through two separate lines of ancestry.