To reveal his nakedness/ to call a bluff
Figuratively: to reveal him in his nakedness. By implication: to expose his secret (in the source: 'he revealed his nakedness,' meaning, he performed a mini-act or exposure of nakedness).
("They revealed her nakedness; her sons and her daughters took her, and they slew her with the sword, and she became a name among women, and they judged her." Ezekiel 23:10, and likewise: "And if he says: And is this only? She dared to uncover the nakedness of her harlotries; your life, if you saw Rachel’s song and her poverty, you would flee before her." - Immanuel the Roman (13th century) / The jar of manna and Jeroboam’s calf, and likewise: "This was a sin! For in this we revealed the nakedness of our father and the nakedness of our mother together, when we handed everything over to the evil enemy, trembling with fear at the two knocks." - Admiel Kosman / We Sold the Car)
Translation
Expression (Hebrew)
גִּלָּה אֶת עֶרְוָתוֹ שֶׁל
Definition (Hebrew)
בִּמְלִיצָה: גִּלָּה אוֹתוֹ בְּמַעֲרֻמָּיו .בְּהַשְׁאָלָה: חָשַׂף אֶת סוֹדוֹ ( בַּמָּקוֹר: גִּלָּה אֶת מַעֲרֻמָּיו, כְּלוֹמַר, עָשָׂה מַעֲשֶׂה מִינִי אוֹ גִּלּוּי עֲרָיוֹת).
("הֵמָּה גִּלּוּ עֶרְוָתָהּ, בָּנֶיהָ וּבְנוֹתֶיהָ לָקָחוּ וְאוֹתָהּ בַּחֶרֶב הָרָגוּ ,וַתְּהִי שֵׁם לַנָּשִׁים וּשְׁפוּטִים עָשׂוּ בָהּ" יְחֶזְקֵאל כג י, וְכֵן:"וְאַעַן וְאוֹמֵר: וְכִי זֹאת בִּלְבַד הֵעֵזָּה פָּנֶיהָ/ לְגַלּוֹת עֶרְוַת זְנוּנֶיהָ/ חַיֶּיךָ לוּ רָאִיתָ שִׁירַת רָחֵל וּמֵעֲנִיָּה/ תִּבְרַח מִפָּנֶיהָ"- עִמָּנוּאֵל הָרוֹמִי ( הַמֵּאָה הי"ג)/ צִנְצֶנֶת הַמָּן וְעֵגֶל יָרָבְעָם, וְכֵן:"הָיָה זֶה/ חֵטְא! כִּי גִּלִּינוּ בָּזֶה אֶת עֶרְוַת אָבִינוּ וְאֶת עֶרְוַת אִמֵּנוּ גַּם יַחַד!/ כְּשֶׁמָּסַרְנוּ הַכֹּל לִידֵי הָאוֹיֵב הָרַע, בְּשִׁנַּיִם נֻקְשׁוֹת, רוֹעֲדִים מִפַּחַד"- אַדְמִיאֵל קוֹסְמָן/ מָכַרְנוּ אֶת הָאוֹטוֹ)