be brother-in-law
Definition:
(Piel) to perform levirate marriage, perform the duty of a brother-in-law 1a) the duty due to a brother who died childless - to marry his widow and have a son for his name
Definition:
to marry a (deceased) brother's widow; perform the duty of a husband's brother, marry.; a primitive root of doubtful meaning; used only as a denominative from
h2993 (יָבָם)