Where does “bau” come from?

bau (Iban) comes from Malay bahu, from Classical Malay bahu, from Sanskrit बाहु, from Proto-Indo-Aryan baHźʰúṣ, from Proto-Indo-Iranian bʰaHȷ́ʰúš, from Proto-Indo-European bʰāǵʰus — arm.

bau (Iban): shoulder

Definitions

shoulder

Ancestry of “bau”, step by step

Step	Language	Word	Meaning
1	Malay	bahu	shoulder
2	Classical Malay	bahu	shoulder; village chief assistant; many
3	Sanskrit	बाहु	the arm, the fore-arm, the arm between the elbow...
4	Proto-Indo-Aryan	baHźʰúṣ	—
5	Proto-Indo-Iranian	bʰaHȷ́ʰúš	arm
6	Proto-Indo-European	bʰāǵʰus	arm

Every word from Proto-Indo-European bʰāǵʰus →Every word from Proto-Indo-Iranian bʰaHȷ́ʰúš →Every word from Proto-Indo-Aryan baHźʰúṣ →