Throw behind his body/ to abandom/ reject/ cast behind one's back/ discard as worthless
He threw it behind him. He did not give any thought to the matter and abandoned it (behind his body, meaning behind his back).
("And you have turned away from all that were before you, and have gone and made for yourself other gods and images, to provoke me to anger, and have cast me behind your back" - 1 Kings 9 (the Lord to Jeroboam through the prophet Ahijah the Shilonite), and so: "Behold, peace is bitter to me, and you have made my soul drink of the oil of destruction against me, because you have cast me behind your back." "Your body is all my sins" - Isaiah 17:17, and so on: "I have cast the blackness of exile behind my back/ I have poured out my fury on the nations, I have poured out my fury to the end" - Nachman Rez/ For I am lost who has passed away, and so on: "To cast the ways of civilization behind my body and to live in the bosom of nature" - H. Be'er/ Feathers, 11)
Translation
Expression (Hebrew)
הִשְׁלִיךְ אַחֲרֵי גֵּווֹ
Definition (Hebrew)
זָרַק לַאֲחוֹרָיו. לֹא יִחֵס כָּל חֲשִׁיבוּת לַדָּבָר וְזָנַח אוֹתוֹ (אַחֲרֵי גֵּווֹ מַשְׁמָע אֶל מֵאַחֲרֵי הַגַּב).
("וַתָּרַע לַעֲשׂוֹת מִכֹּל אֲשֶׁר הָיוּ לְפָנֶיךָ וַתֵּלֶךְ וַתַּעֲשֶׂה לְּךָ אֱלֹהִים אֲחֵרִים וּמַסֵּכוֹת לְהַכְעִיסֵנִי וְאֹתִי הִשְׁלַכְתָּ אַחֲרֵי גַוֶּךָ"- מְלָכִים א יָד ט (ה' לְיָרָבְעָם בְּאֶמְצָעוּת הַנָּבִיא אֲחִיָּה הַשִּׁילוֹנִי), וְכֵן:"הִנֵּה לְשָׁלוֹם מַר לִי מָר וְאַתָּה חָשַׁקְתָּ נַפְשִׁי מִשַּׁחַת בְּלִי כִּי הִשְׁלַכְתָּ אַחֲרֵי גֵוְךָ כָּל חֲטָאָי"- יְשַׁעְיָהוּ לַח יז, וְכֵן:"נֵכָר, שָׁחֹר גָּלוּת אַחֲרֵי גַּבִּי הִשְׁלַכְתִּי/ עֹל גּוֹיִים אַכְזָר פָּרַקְתִּי עַד תֹּם"- נַחְמָן רָז/ כִּי אָבַד אֲשֶׁר עָבַר, וְכֵן:"לְהַשְׁלִיךְ מֵאַחֲרֵי גֵּוָם אֶת מִנְהֲגֵי הַצִּיוִילִיזַצְיָה וְלִחְיוֹת בְּחֵיק הַטֶּבַע"- ח.בְּאֵר/ נוֹצוֹת, 11)