וַֽיְהִי֙ כְּכַלֹּת֣וֹ לְדַבֵּ֔ר וַיַּשְׁלֵ֥ךְ הַלְּחִ֖י מִיָּד֑וֹ וַיִּקְרָ֛א לַמָּק֥וֹם הַה֖וּא רָ֥מַת לֶֽחִי׃
And it came to pass, when he had made an end of speaking, that he cast away the jawbone out of his hand; and that place was called Ramath-lehi.
Read midrashic interpretation of Judges 15:17: and classical rabbinic exegesis.