A rare Hebrew verb appearing only in Judges 11:40 in the Hithpael stem, meaning to commemorate, to go repeatedly (in a custom), or to rehearse/recite. Jephthah's daughter's companions would "go out to rehearse" her story annually — keeping memory alive through communal practice.
The custom of young women going to commemorate Jephthah's daughter four days each year is one of the Bible's most poignant memorials. A young woman whose name is never recorded gave her life to honor her father's vow, and Israel's daughters kept her memory alive for generations. The act of tanan — going out to rehearse her story — models how communities preserve the memory of costly sacrifice. The Christian practice of the Lord's Supper ("do this in remembrance of me") belongs to this same tradition of sacred remembrance, keeping the memory of the ultimate sacrifice alive until Christ returns.