Where does “bigod” come from?

bigod (Navajo) comes from Navajo agod, from Proto-Athabaskan *-ɢʊ̓tʼ.

bigod (Navajo): his/her/their knee

Definitions

Step	Language	Word	Meaning
1	Navajo	agod	knee
2	Proto-Athabaskan	*-ɢʊ̓tʼ	—

bigod — Etymology, Origin & Word History | Etymology Explorer