Gird it around his waist
He tied his waist around him. In a question: He stuck to him. He walked in his path or adopted his worldview.
("Rabbi Shimon ben Lakish said: If you learn a wise man who is avenger and purifies like brass - gird him about your waist, if the people of the land are pious - do not dwell in his neighborhood" - Shabbat 33a)
Translation
Expression (Hebrew)
חָגַר אוֹתוֹ עַל מָותְנָיו
Definition (Hebrew)
קָשַׁר אִתּוֹ סְבִיב מָותְנָיו. בְּהַשְׁאָלָה: דָּבַק בּוֹ. הָלַךְ בְּדַרְכּוֹ אוֹ אִמֵּץ אֶת תְּפִיסַת עוֹלָמוֹ.
("אָמַר רַבִּי שִׁמְעוֹן בֶּן לָקִישׁ: אִם תַּלְמִיד חָכָם נוֹקֵם וְנוֹטֵר כְּנָחָשׁ הוּא- חַגְּרֵהוּ עַל מָתְנֶיךָ, אִם עַם הָאָרֶץ הוּא חָסִיד- אַל תָּדוּר בִּשְׁכוּנָתוֹ"- שַׁבָּת סג ע"א)