The Austronesian Comparative Dictionary

*biras₂ wife's sister's husband

PWMP biras₂ wife's sister's husband

WMP
Tagalog bilás the husband of one's sister-in-law (WZH); the wife of one's brother-in-law (HBW)
Malay biras connection by marriage (in the case of two men who have married sisters, or of two women who have married brothers
ber-biras be or become so connected
Palawano biras co-brother-in-law (wife’s sister’s husband)