Loosened his tongue/ loosen someone's tongue
Harsh words in his mouth (harzuba means a rope, a string).
("Is not this the fast I choose: to loose the bonds of wickedness, to undo the straps of the yoke, and to let the oppressed go free, and to break every yoke?" — Isaiah 58:6; and also: "He went on to tell her about his work as if they had loosened the fetters of his tongue, which had been bound" — A. Amir, The Love of Saul, 64)
Translation
Expression (Hebrew)
חַרְצֻובּוֹת לְשׁוֹנוֹ (שִׁחְרֵר אֶת חַרְצֻובּוֹת לְשׁוֹנוֹ)
Definition (Hebrew)
דְּבָרִים חֲרִיפִים שֶׁבְּפִיו (חַרְצֻובָּה מַשְׁמָע כֶּבֶל,שַׁלְשֶׁלֶת ).
(" הֲלוֹא זֶה צוֹם אֶבְחָרֵהוּ, פַּתֵּחַ חַרְצֻבּוֹת רֶשַׁע, הַתֵּר אֲגֻדּוֹת מוֹטָה וְשַׁלַּח רְצוּצִים חָפְשִׁים וְכָל מוֹטָה תְּנַתֵּקוּ"- יְשַׁעְיָהוּ נָח ו, וְכֵן:"וְהוֹסִיף לְסַפֵּר לָהּ עַל עֲבוֹדָתוֹ כְּאִלּוּ פִּתְּחוּ אֶת חַרְצֻבּוֹת לְשׁוֹנוֹ הַנְּצוּרָה"- א.עָמִיר/ אַהֲבַת שָׁאוּל, 64)