If he will perform unto thee the part of a kinsman, i.e. take thee to wife, to raise up seed to his brother, as he ought to do.
Related Commentaries of Ruth 3:13
Ruth 3:13
13 Tarry this night, and it shall be in the morning, that if he will perform unto thee the part of a kinsman, well; let him do the kinsman's part: but if he will not do the part of a kinsman to thee, then will I do the part of a kinsman to thee, as the LORD liveth: lie down until the morning.