To change one's mind (skin)/ to be a turncoat
His taste changed. He behaved in a way that was not pleasing to him. He behaved contrary to the way he behaved before.
("Shall the Ethiopian change his skin, and the leopard his companions? Ye also are overcome to do good for the sake of evil" - Jeremiah 13:23)
Translation
Expression (Hebrew)
הָפַךְ עוֹרוֹ
Definition (Hebrew)
שִׁינָּה טַעֲמוֹ. נָהַג בִּצְבִיעוּת. הִתְנַהֵג בְּנִגּוּד לַצּוּרָה בָּהּ נָהַג קֹדֶם לָכֵן.
("הֲיַהֲפֹךְ כּוּשִׁי עוֹרוֹ וְנָמֵר חֲבַרְבֻּרֹתָיו? גַּם אַתֶּם תּוּכְלוּ לְהֵיטִיב לִמֻּדֵי הָרֵעַ"- יִרְמְיָה יג כג)