MegAntioch 36 :וְאַפֵילַת יָת בְרַה לִתחוֹת שוּרָא וּנפַלַת בתרה וְמִיתוּ תַרוֵיהוֹן‏ : she threw her son down beneath the wall and fell down after him, and the two of them died
See the entire entry for ltḥt prep. beneath