to lament. to rehearse with, as in Judges 5:11. to celebrate [her dedication] in praises.
four days in. year. Thus annually her friends "went", evidently to Jephthah's daughter, to rehearse with her this great event of her life: not of her death.
Related Commentaries of Judges 11:40
Judges 11:40
40 That the daughters of Israel went yearlyh to lament the daughter of Jephthah the Gileadite four days in a year.